The subject is vintage Spanish guns, not modern guns. I've seen some of those great $400 to $600 guns. For the most part they are low end guns that can in no way compare to a 700 or similar gun, no matter the maker. These "gems" are cheap imports and to be honest, pieces of junk.
Pretty broad brush you are stroking there with, Greg. This is my $400 "Piece of Junk":

Disc set strikers, a very well fitted hidden third fastener, 3" chambers. Based on actual experience two friends have had with their 700s, I'd take it before either. Break the striker/tumbler in a 700, and you are down for the season, brother, until the gunsmith gets around to hogging a new one out for you. My gun has it's original strikers in it, but I have a spare set all ready to go. It works every time I pull the trigger, so far, anyway. No ejectors, as I don't care for them, or single triggers.
I don't believe the Uggy model 30 changed all that much from the late 1940s, until, say, now, but the Falcon version came with the afore mentioned little extras that current production guns don't have. No big deal. Even without the extras, a model 30 is a great gun, and I'd still buy one in front of a 700.
Best,
Ted