Boker. Haven't had the best of luck with Buck slipjoints, though their lockbacks are awesome.
I sent a new Buck 301 to the spa to have the wobbly blades tightened (bone handled factory custom). They tightened the spey blade to the point where it is almost a nail breaker to pull out but still weak on the way back. In so doing, the sheepsfoot which was already a weak snap has to be pushed closed, no spring snap at all left. The clip is still weak and wobbly.
That being said, I love my dymondwood 303 and yeller 301. My two black sawcuts have proud rivets but the Lancer isn't worth sending in, and I'm just being nitpicky with my 310 whittler. The custom 301 should have never left the factory like that, not for a high dollar knife, and it certainly shouldn't have left repair that way either. Needless to say it's going to have to go back again, which is a hassle.
While I will buy Buck locking knives in the future, I won't buy another slipjoint (especially an expensive factory custom) without handling it directly.
In contrast, every Boker I've purchased (Solingen) has been flawless. I don't know anything about the Magnum and Plus traditionals though. I love that beer barrel handle FarmKid, I have the whittler and it's sweet.