I have both. I tend to use the El Pesc with my old Crate Vintage Club 2110r. It way outshines the tiny little reverb tank in that amp and it does some really nice vintage sounding things to the pushed mid grunt of that little 1-10"combo. Especially if you hit it with P90s. With my Carr Rambler's killer reverb and trem circuit the El Pesc is kinda superfluous, and I tend to use the Jr B with it instead. The Carr is a much cleaner amp with way more headroom and the Jr B has that extra gain stage for a little more kick and grit. Plus the Jr B sounds great as an upright bass preamp.