u/GD69B1

With the current Time War sale I'm thinking about getting some of the War Master. I've never listened to anything with this incarnation but heard lots of good so I am willing to give it a shot. What are his best box-sets? And are they standalone or are somehow connected? I'd appreciate as much information as possible because I'm not able to buy everything. I'm also thinking about 8th Doctor Time War 1-4.

Thanks in advance!