Given my experiences with both rifles I can say for a fact that the AR platform is much much much more accurate than the AK platform
Yes, that is definetly true, but that's not the whole story. The difference between a 1.5moa AR and a 2.5 moa AK isn't as pronounced in real-life situations. (not shooting from a bench and not shooting 300+ yards)
To put it simply I'd rather have my AR in a combat/battle situation with others around me and plenty of supplies. I'd rather have my AK in survival/long term situation.
Both do similar jobs, both do them well, although quite differently. Anyway on to the questions.
Generally .223 or 5.56 Nato for the AR and 7.62x39 for the AK. That being said there are many other options for both rifles. AK (saigas) also come in .308,.223,5.45x39,12-20 gauge,.410, probably more I'm missing. AR's can be had in uhhhh a LOT of calibers.
What are the price range on these?
I'm not sure with the current "situation" so someone correct me if I'm wrong. Generally a decent AK can be found in the $400-$600 range, some cheaper some more expensive. AR's range from $600-$2500+ with rifles in the $800-$1000 range being the best quality/price compromise.
Do certain manufacturers make each?
Yes, many. AK saiga, century arms intl., norinco, arsenal, many, many more.
AR smith-wesson, bushmaster, del-ton, olympic, dpms, stag, Lewis Machine Tool, many, many more.
When ppl think there may soon be restriction on guns these 2 gain popularity at local gun shops here,why is that?
Obama, potential "assault weapons" bans could make both rifles illegal to buy. But they aren't even "assault rifles" in the form that you would buy them at a local shop. Politicians like to use that phrase to scare the average Joe into thinking they are only used for killing innocent people. The are carbines, pure and simple, no more dangerous than a ruger mini or any other auto-loading rifle.