I am a big fan of Vicious. I was always a Stren user, but in my area it can be tough to find in 4lb and 2lb, and looking for it one day a clerk showed me the SOS brand of line, then looking for SOS online one day I found Vicious. Recently, as an impulse buy from a thread here, I bought some Gamma Panfish and Ice. I didn't care for either of them. I found them both to brittle and too easy to break, so, back to Vicious I went. I only use mono and I change my line regularly, so it fits the ticket for price and amount of line on a spool to get several re-spools done in a year.
I have been using Vicious Panfish 4lb hi-vis yellow on a couple rods. No complaints other than I wish I could cast it farther but I dunno what would be better. Label says it is a copolymer line.
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Bill