I carry a Vamo with a vivi nova tank on it in my dress pants, so stealthy I am not - but I take your point. The gripper is small but as jefsview said, it's plastic (and has had some mixed reviews about build quality). It's in my shopping cart right now to buy but only because I want something like that to have on hand, but it won't be my go to device because an 18350 won't last me all day and I don't want to carry extra batteries. It's also in my cart because it's $15 and I feel it's a low price to give me another option.
The MVP, one of my co-workers just picked one up, it's sturdy, but to me, really not that big at all. Even with a mini nova that he has on it, he can easily slip it into his front jeans or dress pant pocket. It's a little on the heavier side compared to the gripper, but nothing like a vamo. Of course you already know about all the features it has, so honestly, I would recommend this. You can always pick up a gripper when you have a spare $15.
Is there a local B&M you can go to? a lot of the them carry the MVP and you'll be able to test it out in store. I don't recommend you buy from them unless you get an awesome deal as you can get them for under $50 from Fasttech.
Edit - Sorry, just checked, it's $19.40 for the Gripper from Gotvapes.