Yeah, I stopped bottling and switched to kegs, too. I got tired of spending all the time sterilizing bottles, and I would inevitably end up with a few that didn’t carbonate properly.
When I was bottling, I tended to use dextrose just because that’s the natural sugar produced from the malt and I didn’t want to change things any.
For my lawnmower beers, I use honey. A friend brought me ten pounds of clover honey from Idaho, and it added a really nice flavor to the beer.