Sync on my main tablet, because it has the best 2 column layout for my needs.
Connect on my phone where 2 column isn't really a big factor, with summit as an alternative on there because I never have decided which of the two I prefer.
I don't use lemmy on laptop/desktop because I dislike the experience via browser. It would be fine for passive scrolling I guess, but even with the various front end options, I run into more hassles than it's worth when even the meh apps handle lemmy better and I just don't need anything that could be gained via browser.