ya, i know you can get it with HH, but i'd never do that with an MTB that only does several of those machines a year, they wont have the integration down as well as an MTB that deals with mainly that control.You can get a Siemens 840D or a HH TNC 640 with Grob.
I do agree that there spindles are a bit more niche, not really a one size fits all. To be fair though the 16k Grob (206NM) does have way more lowend than the 20k GF (120NM).
If the OP is using 14+" tools and cutting steel the HSK100 is almost mandatory, only really drawback is you're capped at 13k rpm which can slow you down a bit in aluminum, but you can take bigger cuts so YMMV.