Plenty of options out there. Anything with a decent, high grade stainless blade and a sturdy lock. Almost any kind of lock will do as long as the workmanship is good. Personally, I'm not such a big fan of liner locks but YMMV.

I used to EDC a large SAK (the Rucksack model) for a long time. For a couple of years now I've switched to a waved Spyderco Endura, which I feel is a really good EDC/backup folder.

Much depends on whether size and weight is a consideration or whether you'd rather pick a bigger folder for heavier-duty tasks.