Oh 90 is better than 75!if you go 90 just go 120 and if you go 120 just go ahead and get a 180 lol you see where this is going.
I will have to look at the dimensions but I think a 90 is wider (front to back) than a 75 which makes it more ideal for rock work.
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Not wider, just taller. Same foot print.
Mike



