I prefer Kbin over Lemmy because it feels like old reddit, and the magazines are a lot more like checking my subreddits than others. It's also not currently defederated with anything, but it's worth noting that could change at any point. Kbin is the fastest growing of any of the instances atm,
At the end of the day, the whole fediverse thing means, within reason, it doesn't really matter where you set up shop.