High-powered mobile armors will almost always dominate mobile suits, especially if they are built for high-speed combat or with the specific job to kill off MS. Look at the RX-78GP-03 Dendrobium Orchis or AMX-002 Neue Ziel in Gundam 0083.
Slightly (
)retconned but those two are fleet killers and can easily take care of scores of mobile suits, and then we haven't even brought in the heavy guns with the NZ-333 Alpha Azieru... Mmm, funnels. And of course, in SEED we have METEOR which function just like the Orchis; a mobile-armor add on to mobile suits.
I like mobile armors.