The first things I look at when comparing motors are weight and kV. Weight is a good indicator of power capability, and kV tells you if the motors will spin a similar prop.
I say weight as opposed to the actual power rating for a reason - sometimes motors are over-rated, or at least the rating is the absolute max with no margin. If you have 2 motors both rated for 200W but one weights 20g and the other weighs 40g, the 40g motor will have a much better chance of handling waste energy (heat). It will stay cooler and therefore is likely to last longer. This is assuming they have the same kV and you use the same battery and prop.