in
I think 2v2 is probably the format best suited for this
If there's enough interest, I actually would suggest playing more than one game each to smooth out variance, since the games can go quite quickly. Maybe each person plays three games with a different teammate each time, if the numbers support it?
Then again, I'm happy to do whatever; as someone who's a little obsessed with Decrypto right now, I'm not necessarily the most objective