The kinds of effects that are included, and overall sound. You can usually judge this by the price.
Telecaster - SG - Jaguar
Princeton Reverb, Extra Reverb
P-Bass - Mustang Bass
Apogee Duet 2 - Ableton Suite
I have the BV120H and forget what anyone says about Crate...The thing kicks serious ASS. 120 watts of tube goodness
I have a GT212 its a 120 watter as well without all the frills and effects just a solid amp with decent tone and killer distortion it's freakin awesome. Crates rule I would play a Crate over a marshall 100W MG anyday
'08 Gretsch White Falcon
'98 Fender USA Deluxe Tele
'79 Greco Les Paul Standard
Airline Stratotone Crafter GAE8

A bunch of funky pedals

Handwired 50 Watt Plexi Lead Clone w/ Orange 4x12