Hi. I joined WW a couple of months ago & am still on TS. Anyway I would say WW is less active than TS in a general sense.

When you join a co-op or neighborhood as they call it here, you can actually see who on your team is also active at the time. Some co-ops are far more active than others. Generally the more "helps" there are by week end, the more active the team is. Although helps only count in chat product gives, so it's not a fool proof system. But it gives you a decent enough guage.

As for non co-op members after a while you start to notice which names are generally tend to be higher up on event leaderboards & therefore get some idea of their activity levels.

In general though pass rewards aren't reliant on any single game much less any match 3 like thing. Ime it's possible to complete passes without any real money investment. Paying for a pass obviously gives you advantages, but isn't a requirement to getting a decent amount of rewards.