For SEA: There's quite the amount of teams that honestly could cause quite a coinflip if they were to match up against international teams. Region-wise,
Thailand is pretty much still the best region. X10 hasn't exactly lost a step even with Patiphan not playing, and with the addition of FULL SENSE and Sharper, they might bring the big guns now.
Indonesia is interesting, however. With the self-immolation of NXL LIGAGAME, new teams have stepped up onto the mantle. Alter Ego finally rediscovering their form in the early stages of SEA competition. BOOM Esports had a rough time, but they finally made it up in Challengers 3 with the addition of fl1pzjder. However, ONIC is a real sleeper team. They've always been a good fringe T1 / top T2 team, but with the addition of Monyet, they might surprise some folks.
The Philippines is an interesting one as well. Bren making it to the playoffs is to be expected, but with Zeal (ex-6045Pirates) gone, the return of Galaxy Racer (ex-Ark Angel) and the rise of Oasis Gaming should bring a fresh new outlook for PH teams coming into the next stage of VCT SEA.
MY/SG is pretty much the Paper Rex show, but with UwU defeating them on Challengers 2, MY/SG might not be a solo performance for much longer.
HK/TW is also pretty much the CBT Gaming show. KPC dissolved and absorbed some of its members to CBT, a practically super team within the sub-region. Five Ace is a team that has always been on the fringes but gets cut off by either CBT or KPC in the past, so it's nice to see them moving up the ladder.
Vietnam is pretty much somewhat unknown. I have faith, but their limited showing in the last Challengers Playoffs might cloud my judgment. Team Big BAAM (ex-SYG) might be their best shot so far, but on the other side, I have zero idea how EGO would perform.
At the end of the day, I'd expect X10 to be the surefire representative, with either BOOM or Bren behind.