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I have used several kinds, and would give a nod to either BD ascentions, mohairs and he G3 alpinist series.
The BDs ascentions are like a big SUV with snow tires. They will get you there, but they are the heaviest and glide the least. They also fold like shit and are bulky as fuck.
the BD mohairs are similar, give up very little in terms of grip and glide better/pack better on the downhill. If you can find the old ones that look like tire treads, buy them. They are awesome.
The only downside of the BDs imo is the tip loops if you're using really fat skis. They're ok if you have pointy tips, but on my whitedots or if you're going to use something with a big fat tip, the loop sucks donkey dicks. It's a moosefart echo away from falling off.
I've also used the G3s, which I LOVE the tip and taip clips on no matter what ski I'm using. They just work on anything. Sort of like a lighter and slightly smoother ascention. Glue is softer too.
Between the two? I'd probably go with G3 again. I just really like their attachment system and how the skins pack into a pocket better and haven't noticed any loss of function between them and the BDs so far.