New couch- 3 piece or corner/ L shaped piece?

It's time for my husband and I to get new couches. We have a stupid lounge (it's really big BUT it's got archways slap bang in the middle of the room on the one side, a little off centre on the other side, PLUS the kitchen door) so how we can arrange the couches is pretty limited.

We've currently got a corner unit but again because it's so old, the hooks for them to stay together have fallen off over the years and it's actually a four piece unit so we literally have bungee corded the set together, else they move around too much.

What do you have, what's more practical? This is literally the first time we're buying couches.