The finished edge on the tape makes tabbing a lot neater and easier. I also use it often to reinforce seams. Whenever I use fiberglass cloth in a location that is going to be painted and finished smooth, I end up having to sand off the edges anyway as there is always a little ragged edge where the cloth ends.
the tape is cheap - say about $50 for a 3 or 4 inch wide roll 50 yards long. - generally 9 oz. I like 3 inch- two strips over lapping an inch or two over the actual 'seam/joint'.
Taped seams by their very nature, will need considerable effort to fair out, so the selvaged edge is a moot point. Frayed edges need just about as much attention, so it's coin flip really. The convenience of a roll of tape can't be ignored.
And purchase a few meters of Peel Ply then practice.
Peel ply is magic. It really helps control stray fibers and compacts the edge of the tape, laminate. A peel plied laminate requires much less sanding to hide the cloth edge.
Well worth having some peel ply in your bag of tricks
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