I can confirm that the drills both have LEDs....
Ah has nothing to do with power. A 1.5ah battery has identical power to a 5ah battery. The only difference is run time.
??? 'Two speed all metal transmission for increased runtime and longer tool life'.
The higher the number the more powerful the tool you are using will be and also last longer. 2ah / 3ah more than ample for any diy at home and will still last 5 or 6 hours with casual use. If using for a bit more than diy ideally 4ah or more would be preferable.