In terms of feel, I prefer a less jarring snap to the turns. This doesn't only depend on whether the magnets are strong/weak, but also the shape/size of the magnets used. Chris Tran really had the right idea using 5×1 magnets in the original line of Cubicle Labs magnetic cubes: the magnets are strong, but at the same time provide a more gradual snap compared to, say, 3×2. (Among my 333s, and ignoring my first magnetic cube with excessively and unusably strong magnets, my Cubicle Weilong GTS2M is the only one where the pull is strong enough to overcome static friction: if I misalign a layer by a few degrees and gently remove my hands, it'll actually snap. The only other puzzles I have that do this are the XMD Bell and the Yuxin 8 Petals Cube.)
In terms of performance (which is to say, my performance on the cubes; how my turning style meshes with them), all of my cubes have feels/strengths all over the place, so it's hard to make a fair comparison. The only magnetic cube I have two of is the Wuque, and I'm using my DIY magnetic one with weak magnets over the Cubicle Labs one. I get better times on my Valk 5 than on my Wushuang (weak/medium magnets), but it's hard to tell whether that's due to stronger magnets or just the cube being better overall.