Bit late to this but i would say the England U20 is alot better on paper than the 6n's nations squad.
4 players who have been added who have stood out at senior rugby for their clubs are
Harry Mallinder - 10, 12, 13, 15 has had a breakout season with Northampton Saints and looks a brilliant talent gotten a few MotM for them this season.
Johnny Williams - 12/13 another one with a breakout season despite being in a relegated London Irish team he was one of the few bright sparks in their team very physical
Theo Brophy-Clews - 10 again similar to Williams in a relegated Irish but proved to be able to handle senior rugby
Will Evans - 7 Leicester Tigers youngster only started playing for tigers senior team in the last month but has impressed, so much so that he kept Tom Croft out of the 23 in yesterdays Semi final game v saracens.
Also England rugby has a new head coach in Haag who replaces the 6N's U20 coach Callard.
It SHOULD be a very different U20's side.