An often made claim is that 5 blades are better for shaving than 3, but this might not necessarily be the case.
While for some people the extremely close shave provided by a 5 blade razor is just what they need, for others, it will lead to nicks and maybe even ingrown hairs.
As a result, you really need to start with a 3 blade shave, and assess the situation from there. If you feel like you would benefit from a closer shave, then by all means make the step up to a 5 blade razor.