I use a Radial ABY switch. It's a bulletproof solution. I have tried stereo, but in my experience it's not as dramatic as wet/dry. I read earlier in this thread about having no effects on the dry signal, but I don't do it that way. I run compressor and drive pedals to both and modulation, delay and reverb to the other amp. I really like the sound of the dry note on one side and the repeats on the other. I don't like clean/drive sounds as much unless the drive is significantly under the clean.