Thanks for the input on that. The Multidrive is in the lead, although some people say it sounds a little compressed, I'm not sure that's a bad thing. It would be for my proposed pedalboard straight to power amp rig. Since I can crank the RAT, no need for something that's high gain, so if it can get that just breaking up tube amp tone, perfect. The Catalinbread SFT is still in the running, but every demo I find of it online seems to focus on cranking it up, which doesn't at all seem like the purpose or strong suit of that pedal.
I haven't personally used the Multidrive but I toured with a guy who did and it sounded fantastic. I'm a huge EBS fan (have two pedals - Phaser and Wah - and a Fafner amp) in general.