My initial thought, was Vampire.
Long "Life"span, resistance/immunity to death by conventional means, immunity to diseases, night vision, increased strength and dexterity are all relatively good traits.
Unfortunately the downsides can be an issue...
Not being able to go out in the day (Depending on what kind of vampire, some versions can go out in sunlight whilst others are instantly destroyed), having to feed off other people (Again, depending on what kind... Some require human blood (Which I'm not put off by), some drain other aspects of humans etc)
So my choice will be a Demon.
A lot of iterations of demons can hide in a human form, which would allow for a normal life (None of this being hunted down by everyone for being a potential threat to civilization or people trying to steal the gold you're hoarding) then there's the demon form that can come with wings allowing flight (Saves time and money on travel), enhanced strength, long lifespan etc there's also the possibility of having magical powers and be able to cast spells.