8330a also "limits" you to expensive Genelec SAM subwoofers (instead of some other brand), if you want to keep GLM calibration, which is the reason to get 8330a instead of 8030c. That was one of the biggest reasons I didn't want Genelec SAM/Neumann DSP models, and got one 8030c for less than 400€, almost new. Still trying to find other one.
After comparing it (1vs1) to my old Adam A8X there was no contest, Genelec was miles ahead in every area. Pretty disappointing, as Adam's normal price was 1.5x that of Genelec.
I'm planning to get two subs, so the price difference of 8030c+subs vs 8330a+SAM subs is very big. Also, 8330a wasn't even my consideration, because Neumann KH 120 II new here is not much more than used 8330a, and it is better. If I was going to put in big moneys, to make it more simple, I would just wait till next year and get Neumann KH 310 DSP + MA1 (expected to release next year), it will be awesome, but what is the price? 4500€ minimum I think. KH 120 II + 1 KH 750 + MA1 is also not bad option. Or KEF LS60 Wireless (4500€ used, seen many). KH 120 A is of course good competitor for 8030c, if you can find it used. Probably a bit better, but worse features.