would inform the debate to list components and prices.

1. speed & cadence : I see Wahoo listed at $70 for the combo vs $55 for Garmin.
2. HRM : It is where the alternatives get complicated. HR strap is, let's say $60; wrist is about the same.
3. Display : could be a bike dedicated head unit, or a smartphone. In my experience, both work well, with dedicated head units being more weather resistant than smartphones. Not obvious how to consider prices, as a phone is most likely to be something that you have already, so you may want to consider the price of a decent mount+protective shell; a bike computer is a single purpose device that will set you back... it can vary a lot. from under a $100 to close to $1000 depending on the features you are looking for.

4. Then there is the "I have two bikes" issue. Means two sets of sensors.

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5. You may want to consider a smart watch with integrated HR. Not the best on a bike, but the bang/bucks ratio is decent.