i'm about to get a new guitar for $300 in a few minutes. which is better the Epiphone les paul studio or epiphone g-400 sg?
g-400 SG. cheap Lps like the one i have suck.

go with the g-400

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I sell both in my guitar shop. Epi LP Studios are kinda cheap. The neck/fret feel cheap on those. I guess that would be OK if you were solely a rhythm player, but string bending just don't feel right on them.

Epi G400s are much better qualty IMO. The neck/frets seem better quality. Like most SGs I've played, the G400 neck is wide and relatively thin compared to a Les Paul.

Good luck.
^+1 And don't forget about that upper fret access and lighter weight.