Depends on what you want, it's a very subjective thing what soft is to one person is not the same to the next, try to blag a ride in a car with each if you can.
Avo coilovers will run rings around koni on grip, but not in comfort terms, where the koni are vastly better, I find them too soft for me even on hardest setting, a avo coilover is cheaper to rebuild than but a koni if needed, my last pair cost me £66 all in posted back, and that included pick up cost for the pair.
If people don't want to use the "cheaper" avo I have no doubt they have tried the more expensive £1500 a corner ones from avo with remote reservoirs etc, saying that thrust 2 was on SPAX shocks, don't think they are an off the shelf fitment though!!
tabetha