How to compare ETFs: a mandate-first checklist for fund selection

Investors search for the best ETF when they usually mean the best ETF for a specific job: core US equity, international diversification, dividend income, investment-grade bonds, or a sector sleeve. Comparing two similar tickers without a mandate produces confident answers that do not fit your portfolio.

This guide gives a mandate-first checklist for ETF vs ETF comparison. It works in a spreadsheet, a screener table, or a future percentile heat map. Buydy's ETF screener is live today; ETF fund percentiles in a dedicated heat map are in development.

Step 1: Write the mandate before you open tickers

Answer in plain language:

• Role: core holding, satellite tilt, income, or ballast?
• Time horizon: years, not days.
• Account: taxable vs tax-advantaged (affects distribution tax).
• Disqualifiers: what would rule a fund out immediately (leverage, narrow theme, minimum AUM)?

If two funds serve different roles, comparing them on one grid creates false conclusions. VTI and SCHD can both be "good" while serving different mandates.

Step 2: Confirm you are comparing like with like

Check:

• Index tracked (cap-weight vs equal-weight vs factor rules).
• Geography (US only, developed ex-US, emerging markets, global).
• Asset class (equity vs bond vs mixed).
• Share class (fee tier and ticker suffix).

Two tickers in the same category label can still differ on rebalance frequency, sampling, securities lending, and dividend treatment.

Step 3: Compare cost and liquidity

Metric	Why it matters
Expense ratio	Compounds over decades; compare same share class.
AUM	Very small funds may face closure or wider spreads.
Average volume / spread	Matters when you rebalance or tax-loss harvest.

A fund 5 basis points cheaper is not automatically better if spreads, tracking, or index fit are worse for your use case.

Step 4: Compare structure and holdings

Open holdings and factsheet data:

• Holdings count and top ten weights (concentration risk).
• Overlap with funds you already own (duplicate exposure).
• Sector and country weights (two "global" ETFs can diverge).
• Securities lending and sampling (can affect tracking).

For equity ETFs, you may drill into top names with Buydy's stock heat map to see whether concentration sits in names you already hold individually.

Step 5: Compare income and distributions

For income mandates, compare:

• Distribution yield (understand whether it is trailing twelve-month, SEC yield, or another definition).
• Distribution frequency and history of cuts.
• Growth vs high-yield policy (dividend growth ETFs vs high yield).

Yield alone is not quality. A higher yield can reflect sector bets, option income, or a recent price drop.

Step 6: Compare performance with context

Return windows (1M, 3M, YTD, 1Y) belong after structure and cost:

• Recent leaders may reflect a sector regime, not durable edge.
• Recent laggards may be structurally different, not "cheap."
• Tracking difference vs the stated index matters for passive funds.

Use returns to ask what changed, not to declare a winner.

Step 7: Bond and hybrid ETFs: add duration and credit

For fixed income, add:

• Effective duration (rate sensitivity).
• Credit quality mix (government, investment grade, high yield).
• Currency hedging (hedged vs unhedged share classes).

A "bond ETF" comparison that ignores duration compares unlike risk profiles.

Step 8: Document a decision memo

For each finalist, write five lines:

1. Mandate fit (yes/no and why).
2. Cost and liquidity verdict.
3. Overlap with existing holdings.
4. Main risk (concentration, factor bet, rate exposure).
5. What would remove the fund from consideration.

This memo survives the next performance headline.

Where a percentile ETF heat map helps (planned)

Side-by-side raw tables work. They also create friction when you compare six funds on twelve metrics every week. A percentile-based ETF heat map (in development at Buydy) aims to show display percentiles vs a peer set with raw values for verification, similar to the live stock heat map discipline.

Percentiles reduce normalization work. They do not replace reading the prospectus, checking overlap, or assessing mandate fit.

Read the workflow overview in what is an ETF heat map and the product direction on ETF heat map landing.

Build the shortlist in Buydy today

1. Screen with ETF screener workflows.
2. Apply this checklist to two or three finalists.
3. Frame macro context with global index monitoring.
4. Avoid process traps in ETF screening mistakes to avoid.

See pricing and resources for membership details.

FAQ

How do I compare two similar ETFs?

Start with mandate and index methodology, then compare expense ratio, AUM, spreads, holdings overlap, sector/country weights, distribution policy, and tracking difference. Only then use return windows as context.

What is the best ETF?

There is no universal best ETF. The best fund is the one that fits your role, cost tolerance, liquidity needs, and existing portfolio overlap.

Should I compare ETFs on performance alone?

No. Performance is useful context after you understand fees, exposure, and index rules. Performance alone hides structural differences.

How do I check overlap between ETFs?

Compare top holdings and sector/country weights, or use a dedicated overlap tool. High overlap means you may be doubling exposure, not diversifying.

Are Buydy ETF percentiles live?

Not yet for fund-level heat maps. The ETF screener is live; ETF percentile comparison is in development.

Research summaries, not investment advice.