I always thought they are similar: i am a big fan of both
-They are powerful: the serve and the groundstrokes (is that the word?), they hit the ball very hard and the ball goes very fast
-They are very talented and have touch and fine shots
T-hey are tall and have some problems with the volley, although Marat had improve a lot in that section and Chucho is growing up too playing doubles
-They have wonderful parallel backhand down the line: the difference is Chucho has a one hand backhand, as the old ones! very nice...
-They are very good players of all surfaces...Chucho is improving his game in hard courts and the match against Blake in first round AO is a sign of this
- They are shy, nice guys, humble, honest with the press
-Thay are good looking!
-Both played sometimes (as Gaudio said) as it doesn't matter!!!
Chucho beat Marat twice: Barcelona 2005 and in Arag 2002, i think, when Argentina won but in both matches Marat was injured!
Both are lovely!!
Mybe Marat is a little bit more charming....