u/AdPretend2359

Some may say it's not the best sub to ask this question but I feel this is the only place that can help me, I previously had an apple watch after a swimming session it decided to die, so I don't have a watch anymore.

I have a history of my fitness there and i was okish with battery and used a bit of smartness here and there.
Now I'm a bit more serious in cycling and aiming for be a better cyclist with the dream of 3W/kg.
My budget is same as apple watch not more than that so Venu 4 for example could be an option.
I know the watch couldn't help me to achieve my goal but may provide good insights.

What is tempting me for the Garmin is that if i have that Garmin connect can have better understanding of my off bike and provide better insights for cycling and it's plan- I have a Garmin edge 850 for the bike itself which is great for the cycling and i usually go for the ride without the watch.

My dilemma is the Garmin integration and battery and Smarg features and history of apple watch fitness.
I think cyclist experience could help me more than any other people to make the right decision!

My question is how often do you swich your bike with trianer and wheel.
Does it make sense to buy a cheap second hand bike under 200$ or less only for the trainer? Or it's better to use my own bike?
I'm afraid because of some laziness I either never go out for ride or never use the trainer!(Also I make my hand dirty everytime which is very annoying!)