When I say this, I am thinking about a 7.62x39 and a 5.45x39. I love my AKM, but sometimes I need a break, mainly because I just want a light recoil alternative. Then I like to switch back and shoot a hard hitting AKM knowing that I am hitting steel plates with authority. Change is something that keeps you coming back for more. You can get bored of the same old thing day in and day out, so you need to have options.
Shooting the AKM, or a variation, is great. You feel every shot and it is exhilarating. Practicing hitting targets knowing that the hit would hurt and you are laying lead, or steel, down with authority. That is the excitement of the 7.62x39. Add a red dot and watch your shots strike a target that you can see with greater detail adds to the thrill.
Switching to the AK74, or another variation, is like switching from a 68 Camaro to a 370z. You may not have the raw unrestrained power, but you have more tuned, less felt, surprising power. You adjust quicker shot after shot, not even noticing how fast you are placing round after round on the target. You realize, you feel like you are shooting a .22, but hitting the target with some serious lead, or steel. Damage is being delivered, but in a more polite way, and with a smile.
If you get an AK, you need to experience the thrill of both!