The cost is going to be around the same.
Pros (Akasa Neo)
Don't need to buy indiividual VRM sinks
Silent
2 slot
Cons
Need to buy thermal paste
3 pin(can't plug into vid card)
converts into 4 pin(fan stays at 100%)
Pros (Accelero Twin)
Bigger = better?
Silent
Don't need to buy thermal paste(mx-2 pre-applied)
4 pin(controls thru pwn and can be plug into vid card)
Cons
3 slot
VRM sinks don't stick well
Will have to buy separate VRM sinks or thermal epoxy
As for temperature differences
I couldn't find a review or comparison between the two
Pros (Akasa Neo)
Don't need to buy indiividual VRM sinks
Silent
2 slot
Cons
Need to buy thermal paste
3 pin(can't plug into vid card)
converts into 4 pin(fan stays at 100%)
Pros (Accelero Twin)
Bigger = better?
Silent
Don't need to buy thermal paste(mx-2 pre-applied)
4 pin(controls thru pwn and can be plug into vid card)
Cons
3 slot
VRM sinks don't stick well
Will have to buy separate VRM sinks or thermal epoxy
As for temperature differences
I couldn't find a review or comparison between the two