You can also look into a Radial Headlight. Allows you to control up to four amps. You can run all four of them, or switch one by one, or even switch between pairs of them.
I own the Lehle Dual SGoS. I use it and a P Split to switch between 3 combo amps in my home studio set up. One of the most versatile & useful A/B box on the market, but it's pricey.
I've used a whirlwind switcher back in the day around early 2000's that worked very well for me. Used to run a dual rec and ENGL Powerball together.
Given the choice though I'd probably go with Lehle or a radial.