Compare your options
The money decisions people genuinely agonise over rarely come down to one number. We put each side side by side — the trade-offs, the maths, and a clear take on when each one wins.
A calculator gives you a number. A comparison gives you a decision. Each page below weighs two real options against each other — the pros, the cons, the numbers on a worked example, and an honest verdict on which suits which person. Where the answer genuinely depends on you, we say so rather than forcing a winner.
🏠 Mortgages & property
Big, long-running commitments where the right choice turns on your risk appetite and time frame.
Fixed vs tracker mortgage
Certainty versus betting on rate cuts. Why the two are priced closer than they’ve been in years — and the choice is really about risk.
Compare →Buy-to-let vs index fund
Leverage and control against passive, diversified growth — and the tax changes that have tilted the maths against property.
Compare →💼 Working for yourself
How you structure your work changes what you keep — sometimes by thousands a year.
💷 Tax & saving
Decisions where the tax rules — and your time horizon — quietly do most of the work.
Pay rise vs pension contribution
Cash now or deferred with relief? Below £100k it’s a trade-off; in the 60% tax trap, a pension wins big.
Compare →Cash ISA vs stocks & shares ISA
Same allowance, two different jobs. Why time horizon decides — and the growth gap that opens up over the years.
Compare →🧭 Why a comparison, not just a calculator?
Understand the choice
See both options side by side — what each one actually does, and the trade-off between them.
See when each wins
Every comparison ends with the situations where one option beats the other. No forced winners.
Run your own numbers
Each page links to the calculators that turn the general answer into your personal one.
About these comparisons
Each comparison weighs two real UK money options against each other, with worked figures and a verdict. Where the right answer genuinely depends on your circumstances — risk appetite, time frame, tax position — we say so rather than declaring a single winner.
Figures and rules follow current HMRC, GOV.UK, Bank of England and FCA guidance, with the detail held on each comparison page and the linked calculators. See our methodology and sources.
Not financial advice. Calclens comparisons are general information and link to calculators that produce estimates. Rates, tax rules and the right choice all depend on your circumstances. For a mortgage, tax or investment decision, confirm the figures with a suitably qualified professional before acting.