Helis for sure.
I'm dual rated but nothing beats flying a helicopter.I would love to drive a large jet for while but the boredom factor would kill me according to my fixed wing friends and it appears to be difficult to break into that world anyway.
If you want to make money,go overseas,its possible to make 3000stg or more pm on contracts,most jobs are rotational so you can freelance on your free time.
As for tiltrotor you will need to be dualrated,with an instrument rating in one type(A or H).If you have a multieng (A) it will be an advantage but it is not necessary.However helicopter rated pilot will have the advantage due to the inherent problems which can occour with a helicopter such as settling with power.This has been brought home to the US Marine Corps due to the recent loss of a V-22 due to vortex ring state.You can find an excellent thread about this in the archives going back about 3 months.