the difference are that the first one is slc, 64 mb cache
second is mlc and has 120 mb cache but the issue is that which ddo i go for.
The second seems to have better performance but because its mlc the life span is much shorter than slc.. so which do i go for
it will be used for server purpose
You can't RAID 0 with two drives of different capacities. Whenever possible, you would want to use RAID 0 with identical drives. I would say stick with SLC - something like a server is under constant demand, and SLC drives are quite simply more durable.