if you want to be able to walk around in the clipless shoes, then MTB is better.
TIME ATAC alium pedals are about $50 for the pair.
if you don't mind not being able to walk around properly, then take your pick of shimano SPD-SL or LOOK Keo classic. They're really not that different.
For shoes, it's best to go to a shop and try them out, because they don't all fit the same.