There are a few tunes (if we do them) that really require some slap, and some more "pop/rock" or "sooth jazz" bass tones. If we weren't doing those I'd just play the RA for sure.
Really unique tone and fun to play. I feel the scale a little bit, but for the sounds I get with this bass, I'm going to try and work through it.
I used to play my Zon Lightwave fretless pretty much all the time, even for blues and funk. Slapped it too...but it isn't the same tone.
If you change your approach to the instrument and use the B string up above 5th "fret", the scale difference becomes pretty negligible. I find that I often will be playing a tune in F and only go down to the nut if I want a really defined attack on a thinner string.
I'm getting really curious about a fretted RA. I'm going to try and play a fretless mouse this week, and if I bond with it will order one. When the Deep 5 comes in I'll likely sell my MB-2, but am wondering about a fretted MB-2. Hmm...
Ok...here we go. In my experience, the 35" five-string MB-2's don't have anywhere near the upright 'mojo' as the 34" four-stringers. This is based on owning one fiver, and playing maybe a half-dozen other ones of various woods (i.e. ash/maple top, alder/maple top, both body woods with koa tops, etc.) - and comparing/contrasting those against at least a dozen four-string models.