Mas bet ko - I prefer this over this ...(If you are a straight guy, avoid using this expression as they might get the wrong impression that you are a gay. However it is good that you understand what it means.
Mas bet ko damit ng mga lalaki!" - I prefer guys clothes.
if you meant "it suits me better" - mas bagay sa akin
Mas bagay sa akin ang kamiseta/t-shirt na ito - This shirt suits me better.