Be advised that Sola has worse battery life than U.. But expandable memory is a better tradeoff
I've heard that apps and games can be transferred to Micro SD cards in Android 4.0 (m not familiar with that interface yet), if that happens then the 4 GB user memory in Xperia U can be utilized for apps and games too right(besides the other 2 GB they provide)? And does the Xperia U support pen-drives? Then there will be no reason to store video files or movies in user memory.
Lol
Dude both have same
Mali 400
Edit: Sola got 265PPI whereas U got 280 PPI
Okay thanks for the info!

Sola is better then!

@shreymittal then the display quality of U is better right? will be a whole lot different than Sola though?