I took advantage of the free 1month trial from Bkool and while I enjoyed it, Zwift ended up being more fun for me.

The option to have videos vs graphics was nice, but some of the videos were less than stellar, and the graphics weren't as nice as Zwift either, mostly just generic roadside, however, it was smart enough to pick up the fact that you were going through a city, as more buildings woudl appear. The biggest pain I found with the videos was that they'd be slightly off, the video would show you climbing even though the incline doesn't go up for several hundred more feet.

The ability to create your own courses was nice. I made a few routes around my old hometown, but it really just wasn't that exciting to ride, and since the rides are uploaded to Strava as "virtual rides" there's no way to even compare yourself to others in the area that have ridden that segment. Of course, this is probably a good thing as it'd be a pain to have people on trainers stealing segments from those actually riding them, but I do wish there was an ability to somehow compare.

The ability to create courses, along with the number of courses already available definitely outranks the 3 courses offered by Zwift, but I found myself riding alone most times, on a course that no one else was riding, or on a course where the handful of other people riding started 20 minutes before me. On Zwift, there's always people around you riding...a new carrot to chase, or a wheel to grab. For me, that adds a lot to the fun aspect of the whole thing.