As about stereo rig, idk guys if you are the only guitarist in a band then 2 amps are almost essential. Look at the bands like Royal Blood where Mike Kerr sends his bass into 2 amps (1 pitch shifted up to imitate guitar) and it works great.
To be fair, Mike is a bit of an anomoly as there is no guitar only bass so he needs to cover a much wider range.
I've played in a signle guitar band for many years and never used 2 amps so almost essentail is a bit strong and simple can be more effective....... BUT I agree 2 amps offer something else so defo good to experiment and music type is a big factor I feel.