I'd go pedals. Easy to move between bikes, take on vacations for use on rental bikes (when we get back to that), you don't need to sell them with the bike, etc.

If you go with the crank-based unit, I'd just leave it on the outdoor bike and use the power curve estimates for your dumb trainer to Zwift.

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Pedals are kind of the no-brainer answer here, because you checked the major criteria: use on multiple bikes.

That said, if you could get a screamin' deal on 2 Spider PMs, then that might be worth considering.

I almost bought a second set of Assioma Duos earlier this spring for my bikes because I was jumping between two bikes more frequently. But, there was no inventory anywhere. I may still one day.

I just signed up for the reservation to purchase the Favero Assioma Duo's as they are out of stock everywhere and it says they will be available in 50 days. It will give me time to read Training and Racing with a Power Meter. Reviews are all positive and surpass the Garmin Vector 3s and at a much lower cost and also undercut the Powertap P2 pedals. The Garmin and Powertap pedals are available now to purchase if you are wanting them now as opposed to waiting. I'm going to wait on the Favero's and get an additional set for my wife.

Having a pedal-based pm is very handy for switching between current bikes, future bikes, rental bikes... However, another consideration would be to get the pm that you’re getting a deal on for the outdoor bike, and then put the money you save toward a smart trainer for the indoor bike. If you spend several months a year inside and have a dedicated trainer bike, a direct drive smart trainer is nice to have...

Unless you have different BB on the bikes then swapping a quarq between bikes is easier than pedals - one bolt not two pedals..

I've swapped the quarq between two GXP bikes for years. One is 9 speed one 10 speed. I've another that is 11 speed and has it's own Quarq as it's a different BB.

Oh, and the 9 & 10speed bikes - I'm using shimano 11speed chainrings with no issues.

I timed the quarq swap once at under 40 seconds when not rushing. All you need is a meaty torque wrench (which you probably are going to want anyway).

You'll get tired of swapping the PM from bike to bike. I would buy the Quarq and then find a cheap used PT rear wheel for the trainer. I'm kind of partial to Quarq, I bought one used almost 10 years ago and it's still going strong.

I guess some people may do, but I never did. I actually got fed up of changing the 'spares' kit between bikes and ended up buying another set of levers and multitool as the faffing there was too much and yet the quarq swap never was. I guess the cost differential may have played into that choice..... ;-)

I have decided on the Quarq. Thanks for the advice. One last thing though:

My 2 x bikes are differently groupset-ed. One has 10-speed Ultegra and the other has Ultegra R8000. So, do I go for the Shimano version with the 4-bolts and commit to Shimano rings (and use the R8000 rings), or do I go for the 5-bolt version and open myself to more options later when I need a new chainring (and use the Praxis rings I have, which should work with both 10- and 11-speed)? I'm leaning towards the 5-bolt version...

Oh, also, the Praxis is 52/36 and the Shimano is 50/34. So, if I go with the Parxis 52/36, would I need a new chain to use on the bike that currently has the 50/34?

You'll love them. One of the rare products in triathlon at really overperforms and 'just works' (many ST threads about this.) At an amazing pricepoint.

I swap mine all the time between my TT bike and my road bike, minimal hassle. Connects every time, quickly, no weird issues whatsoever. Great charging clamp and super helpful 'on' light. Seriously, there is almost nothing you can criticize about this other than that the real LONG-term reviews aren't quite out yet (but we're getting there.)

Even if for some reason you dislike them, I guarantee you'll sell them for a great price nearly instantly. As opposed to my powertap hub which was $1000 when I first bought it - I'd be lucky to get even $150 for that wheel now.

I have pedal, crank and wheel based PMs. Unless you want non KEO cleats, pedals are definitely the way to go. And the Favero are hard to beat in terms of price and reliability (and I have Garmins on one bike, Favero on another).

I have a Power 2 Max crank based and have loved it. No issues in over a year. I have seriously considered pedal based on my next bike but then I could not run speed play pedals. If I sell the current bike with the PM, I would consider P2M again because it just works. I only have one road bike though.