sounds like a silly question when you read the title, but .... the guitars have the same tuners, same wood, same scale and I'm going to put in the EMG pickups in both. if you look away from the neck profile, tummy cut, weight, etc. because I like to play on both.
what guitar should I buy? personally I like look of the Epiphone but will i get more out of the LTD sound wise and quality?
sorry for my bad english
Modern Epiphones, with a few exceptions, blow pretty hard.
In my experience, the LTD is better and comes with the pickups you already want. I haven't played the Viper 400 but I've played the EC400 (Les Paul shape) and I love it, for the money.
You need to play them both, though. They will sound different.