RC damper is an entirely capable Charger damper with exactly the same rebound circuits and exactly the same adjustable LSC. The compression circuit on an RC doesn’t have extra RCT3 fandangos for preset (marmite) pedal and lockout settings. Nothing to do with DPA though.
Aftermarket, everything is likely to be RCT3 so the spring layout is the only difference.
The performance compromises of DPA vs Solo springs aren’t explained well anywhere. Bottomless tokens for DPA are now available (backwards compatible to all DPA Pikes, btw) but whether you’d want to use any is moot.
Complexity vs reliability: I am immensely grateful for the timing of this thread because it has just jogged my memory that the behaviour I am currently seeing on my DPA Pike is a repeat of a glitch it had back in May. Something gets screwed up in the air spring and the fork is unable to use the last 25mm of travel in the full extension mode.
On practice day for an Enduro, I’d been using the lowered position for extended climbs (I never usually touch the feature) and the fork started not using its travel. I fixed it overnight by pulling the top cap and DPA shaft. I didn’t get to find out exactly what had glitched in it, but that experience was enough for me to not use the lowered position ever since. In the last few days out in the Alps I have lost the use of the same 25mm of travel. Hadn’t even connected the two occurrences until replying here. This time I haven’t intentionally been using the lowered position at all. The fork performance is still very good and it now turns out I’ve been hacking down DH runs on a 135mm travel fork.
My experience may be a one-off and not necessarily representative.
Solo air = simple = good
RC damper = simple = good, certainly no compromise in basic performance vs RCT3
RCT3 pedal platform? Not needed by me
Linearity of air spring DPA vs Solo? no information available
Usefulness of dual position? Not needed by me.