Just to clarify...
You are comparing/considering these two polishers right?
Meguiars MT300 Dual Action Polisher
Griots Garage 6 Inch Random Orbital Polisher
If so, sort of apples to oranges considering ergonomics, but I wouldn't worry too much about the power of either, or the lack of it because both should be sufficient.
Make no mistake the GG 6" does get and has gotten a lot of love since I've been a member. You have to consider "the flavor of the month" so-to-speak with some responses.
As I told you in my pm, I too had made up my mind on the GG 6" at the time I was ready to buy. Then, Mr. Hahn posted the video of his G110v2 and with Meg's new MFDA system out and the fact they really didn't see a need to operate that machine any higher than speed 4 with that system, that changed my mind and sealed the deal for me.
I still want a GG6...and it may indeed be a bit more powerful which isn't a factor as much in why I still want that machine as much as the factor of me being able to tell someone I own both machines...which is sort of stupid when you think about it and considering I've been satisfied with my G110v2.
My point is, as was in my pm...I'm not afraid to buy and use any of these machines, but you still may want to consider how often and how much they will be used. As far as maintaining your own cars from time to time either go with the cheapest or go with the warranty. It's up to you.
Now if I wan't a Rupes "like" polisher without spending that kind of money, then I'd go with the MT 300...power wouldn't even be considered (it'll have plenty) because I know what the G110v2 can do.
However, If money wasn't an option I'd look more to the Rupes or Boss. It's hard to say which I'd choose because I've never used either, but I'd probably lean towards spending a little less and then consider the warranties. Both should have plenty of power. I'd also want to consider backing plate change options too.