SLO- Average cleans, awesome crunch and leads, its an 80's music amp. You can't pull the newer stuff. Lacks some bass No external bias point. Horrible fx loop. You can't plug pedals because its designed for rack gear. Impressivly built like a tank and excellent customer support. Doesn't sound good at bedroom levels
EINSTEIN - Awesome cleans, excellent crunch, texas mode is really good it goes from clean to JCM800, impressive leads on both channels. Can get heavier than the SLO in gain, channel 1 mode 3 is insane . Excellent fx loop, both series and parallel. You can mix power tubes, and has external bias points. Built like a tank as well, excellent support. Best bedroom level amplifier I've seen to date.
Prices im not so sure, since they don't sell the Diezels in the states any more.
Bottom line if you live in Europe get a Diezel for sure. If you live in the states well.... I don't know what I'll do in that case.