I can tell you about building AR platform, not much about AK. I'm not that big of a fan of AK. But, I've probably built over 20 AR's in various calibers - 5.56, .300 blackout, 6.5 grendel, 6.5 creedmoor and finally .458 socom.
AR is a better platform in general due to interchangeability. For example, I can use a 5.56 lower for a .300 blackout upper. You can keep the lower and cross caliber fairly easy. 6.5 Creedmoor for .308 platform, etc.
If you were going to build 6 months ago, I'd say go Aero Precision. I've got an MK18 Daniel Defense upper on an aero lower. It's a 10.3 build for CQB. It's all going to depend on your price range. You can build for about $800-$1000 for a decent rifle. I'll recommend some companies to purchase a straight up AR and some for building.
AR's I'd recommend:
Daniel Defense - $1300-$1800 range
BCM - $900-$1400 range
Noveske - Higher end
LaRue - $1500
LWRC - $1500+
If you are going to build:
Aero Precision Upper & Lower or Ballistic Advantage
Criterion Barrels (.223 Wylde)
Geissele Rail or any affordable M-lok
BCM bolt or something along those lines
Hardest parts for building are 1. Bolt Catch release - it's alot easier with a Mag Mount or Vise. The roll pins are a pain in the ass to get in without it. 2. Gas block - make sure you are lining up your gas block correctly, getting the correct sizing. Make sure your gas block, gas tube and barrel have the same diameter.
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