panniers or trailer?

Mannman

I've recently returned to cycling (on a Revolution Continental Race bike) in my 50's after a heart problem and a need to exercise - and I'm enjoying it! My plan is to go on a short camping tour later this year, and hope to upgrade my present bike next year with the goal of further continental camping trips and also some audax rides. Two questions: firstly, what types of bike should I be looking at (with a budget of £750 - £1000) - and I'm not a great climber, and secondly should I invest in panniers or a trailer for my trips?
Thanks in anticipation