What's the best cryptocurrency miner ? And is there any trusted site to buy ?
If you are talking about equihash algo, than try:
- for AMD GPUs - Claymore's ZCash AMD GPU Miner v12.6 or v.12.5
- for nVidia GPUs -> EWBF's Zcash cuda miner v.0.3.4b
also for nVidia GPUs you may try dstm's ZCash Cuda miner v.0.5.1 (Linux only)