Choosing between Nitro+ and Pulse 8G 580

[botarnold]

Planning to mine Eth or zcash with 6 rigs. Im choosing between two cards either the Pulse or the Nitro+, are there any significant performance difference in both of those cards? Buying in bulk can get me 36 Nitro+ and 39 Pulses at the same price. Which gpu should I go for? Power consumption is also important.