(CYMA) CM028 AK47 vs JG M4A1

Hey guys,
I've been doing quite a bit of research for my first AEG, and from the likes of it, it seems that the best options for a field gun for competitions as a starter with a budget of around $150-$170 has been either the:
(CYMA)CM028 AK47 AEG

OR

JG M4A1

I have heard really good reviews for BOTH of these guns. Powerful muzzle velocity of around (350 fps-400 fps) good range and accuracy for both of them. Both with metal Gear Boxes and reliable durable material. Built well. I just please need some advice from you EXPERIENCED players please let me know which of these guns is the best for general airsoft competition. Also, if you guys have any other better recommendations of other solid AEGs for a starter please let me know. I hear G&G and Echo1 are also very good options for a beginner AEG.

Thanks for All of the Help Guys!!!!!!!!