Originally Posted by wt bash
Wulff Triangle Taper will do it just fine but so will a good old standard Double Taper. Add a haul and you can shoot a cress bug or bugger/sculpin straight across Breeches.
I agree. With a single handed 5 wt there's no specific need for a spey line. It's really just a variation of a long-belly WF. It would work fine, but I don't think it would offer any noticeable advantage over any other long-belly WF line or a DT line.
More generally, any long-belly WF or DT will give you better control than a standard WF for roll casting and line mending at distances beyond the length where a standard WF head begins to taper down to the running line. If you're not working beyond the head length of a WF, it would depend on the front taper designs of the particular lines you are comparing, but you probably wouldn't notice much difference at all.