I have a number of folding knives that I rotate, but two that are frequently in rotation are the Kershaw Ken Onion Blackout and one of several Victorinox SAKs. The Kershaw folders have been super reliable for me.

I also rotate the Blackout with the Ken Onion Whirlwind. I was really lucky to find the Whirlwind in excellent condition at a flea market for $15.00. I wish those kind of bargains would show up more often.