I’ve struggled with similar questions. I have an inexpensive cateye computer on my bike and I use the free version of Strava as well. The only reason I would use the paid version is if I decided to get a smart trainer for the winter and connect with Zwift. But, that’s an investment I’ve avoided because I’m concerned I wouldn’t ride indoors enough to justify all the cost. I really only use Strava to track my miles and watch the other Strava athletes I connect with. My cateye actually tracks me slightly faster and logs slightly more distance each ride, so I like it better.