Why Miners Prefer 1060ti 6gb over 1050ti4gb, while 1050 is cheaper than 1060

[Gurjinder]

Why people use a costly gpu 1060ti than 1050 ti, 1050 ti has better hash rates in compare to 1060ti , if we compare them price wise.
Is there any specific reason to use 1060,1080?
Here 1050 ti costs around $230 and 1060ti costs $395

[coolcoinz]

It's the performance really. Just compare user benchmarks. Let's take zcash for instance:
EVGA GTX 1060 6GB SSC   6 GB DDR5   2113/9598 MHz   345 Sol/s   
ZOTAC GTX 1060 6GB MINI   6 GB DDR5   1924/4200 MHz   308 Sol/s   

ZOTAC GTX 1050TI OC DUAL FAN   4 GB DDR5   X/X MHz   179.5 Sol/s   
ASUS GTX 1050 TI 4GB GDDR5   4 GB DDR5   1592/8008 MHz   172.5 Sol/s

So you have more or less 50% performance boost for 50% more money and you'll be able to use it longer because if the ram margin. When 4GB becomes obsolete like 2GB has become in ETH you won't have to run to the store.
I don't know where you saw 1050 hashing better than 1060. Any links?