If I mention the Semi-Slav . . .
I Was so Close

the only thing is that you won't get two pawns in the center in these lines since you are committing to e3 and e4 would be a waste of tempo
I like my two pawn centers sadge
e3 is the QGA "Normal Variation", but e4 is the more theory-heavy "Central Variation." With e4, White has more of the center, but must reply more on dynamic factors such as initiative and space since they might not get the pawn back in a few lines; White typically does get it back though - the toughest QGA lines usually involve Black giving back the "extra" pawn for development at the proper time.
thanks a lot for this!

If I mention the Semi-Slav . . .
Then I'd mention that is not QGA, that is declining the pawn right away...but I've played the Semi-Slav with Black before too

does Vienna variation count as QGA or is it still declined?
Mayday...mayday...abort, abort, abort.
tbh, Noteboom Variation in Slav or Semi-Slav where Black plays ...dxc4 is probably more ambiguous, but I'll call them separate openings for simplicity

If I mention the Semi-Slav . . .
Then I'd mention that is not QGA, that is declining the pawn right away...but I've played the Semi-Slav with Black before too
Botvinnik variation but with be7

3.e3 is superior to 3.e4 because that disables 3...b5 because of a trap that someone here already mentioned

3.e3 is superior to 3.e4 because that disables 3...b5 because of a trap that someone here already mentioned
3. e4 has it's good points too, but it isn't as materialistic and White may have to make use of dynamic factors like central control (d4 and e4 is a powerful pawn duo), space advantage (say, in the center), or utilizing the initiative.
3. e4 just takes deeper study, but both 3. e3 and 3. e4 are solid. I wouldn't call 3. e3 "superior", but then again...I actually play 3. e4 central variation in the Queen's Gambit, so I'm biased to its powerful options
the only thing is that you won't get two pawns in the center in these lines since you are committing to e3 and e4 would be a waste of tempo
I like my two pawn centers sadge
e3 is the QGA "Normal Variation", but e4 is the more theory-heavy "Central Variation." With e4, White has more of the center, but must reply more on dynamic factors such as initiative and space since they might not get the pawn back in a few lines; White typically does get it back though - the toughest QGA lines usually involve Black giving back the "extra" pawn for development at the proper time.