Hi, if you're looking for some interesting exclusives for that type, here are a few:
PS1:
Summon Night 1&2
Black Matrix
Riot Stars
Langrisser Series
Super Robot Wars Series
Front Mission 2 and Alternative

PS2:
Summon Night 3
Black Matrix 2
Namco X Capcom
Super Robot Wars Series-I know Impact and Scramble Commander for sure
Front Mission 5

If you want to try some other interesting takes on strategy for those systems, Dragon Force got ported to PS2, and 7: The Cavalry of Molmoth and its sequel Venus and Braves for PS2.