I like Sadowsky tone better but it's more modern and bites better for slap. The Peavey was cool, it has a big tone and more mids to it. I'd go to BassJapan on youtube and watch a lot of bacchus vids because you can get one of those for a great price, and it's honestly better (and cheaper) than a Sadowsky if you like Cirrus- like necks, plus it has some mids on it. Ill have a passive one in a week and I can run it through my Sadowksy too and see how that sounds.
Personally, Im looking for a preamp pedal like a Sadowsky that has some mid boost too. I did miss that with the Sadowsky pre, especially with a maple neck. The Bacchus Jazz has more natural mids to it, so it may not matter as much - ill find out soon.
I'd also add that you will want to give the Sadowsky more play time before worrying too much about spacing. Log around 6 hours or so of good practice and you should notice your slap technique will tighten up.
As much as I love my Forum, that scoop slap on the Sadowsky really appealed to me too.