My preference thus far has been to get both.

My ASys modules primarily take care of the bread and butter modules (Oscs,
MMFilters, EGs, LFOs, VCAs) while my doepfer/3rd party stuff is doing
cv/control like sequencing, logic switching, pattern generating, etc.

Though I'll soon be blurring the line, I've got two PlanB Model12 VCOs on
preorder, and I'll likely pick up a couple of Doepfer A101-2 LPGs and
A143-1 AD EGs to go with them for a mini buchla-ish system in a doepfer
rack.

-Brandon