The franchise, going on for so long, has had a lot of "renovations", so to speak. The animations in each game improve, and some of the transitions are amazing.
This is a video from the very old Compact 3, one of the SRWs made for the WonderSwan, featuring Folka, a member of the Shura race and the pilot of the Ialdabaoth.
The storyline from Compact 3 was carried over for Original Generation Gaiden, the most recent PS2 SRW game, and the Ialdabaoth got a massive renovation.
Another comparison is between the Valsione's original appearance and its most recent as well... and we're talking about a difference of 14 years.
I personally am pumped for when they bring in the storyline from Super Robot Wars Destiny, since that game was very good and had an interesting plot.