Not much in really but the T2130 won't run a 64bit OS but should be slightly faster due to the faster clock speed.
I'd go for the T5300 personally.
T5300 should be better.
1MB of Cache for Core 2 generation processors is too little. Unless the T2130 is 45nm then i would say go for the 5300
the cache restriction is slightly crippling. i'd say the T5300 should be MUCH faster than the 2130