From what we have learned till now version 2 is upgraded a little more. Both version have band selection now and support most CA combos available in India. Now which one to buy? Well amazon is selling version 2 only as version 1 is already out of stock unless you can find one with some offline retailer or buy old one on olx. So doesn’t better which one you buy.
TP-Link Archer MR600 with 4g+ CA support is a solid router with external antenna support and Tp-Link onemesh support. Being a AC router it can help avoid wifi congestion too by connecting 5ghz band only.
Check out best 4g wifi router with sim card slot in India.