Magwell grip? Hate it.
Vertical foregrips? Dislike 'em. I sold the VFG (a good one) that came on my DD.
I'm sure there are countless shooters better than myself who will disagree with my stance. And that's just fine. I like the Magpul AFG on a combat/SHTF type rifle. A $40 AFG replaced the $60 Daniel Defense VFG on my DDM4v3, and I considered it an upgrade. And it was, for me. I prefer no front grip on a varmint/range/precision setup. Buy what works for you. None of my likes/dislikes should dramatically shape your preferences. When it comes to ARs, pistols, or almost any firearm for that matter...personal preference always sits atop of the list of 'must haves'.
That oddball thought above in bold and blue...it's highlighted in that manner for a reason. While it's sort of a generic thought, I feel it'll generally steer you in the right direction. Plenty of folks will tell you what works for them. That's great. There's some value in that information. But what works for you will always matter far more.