barker slip on vs penland pro slip on

I know barkers is better, but the penland pro is almost $150 Cheaper new and I might have found a good deal on a used penland.

So the question is of course barkers is better, but how much better?

I plan on at least a 700 top end in the distant future if that helps.

I have no firsthand experience with either of these so I need help comparing.

If the barkers is that much better I’ll hold out for one.