Placements to avoid and to get! Your opinion! Watch
All programmes have to cover a certain amount of medical and surgical jobs, but some will be heavier on one side than the other. You are usually not allowed to repeat a specialty (apart from gen med/gen surg) in F2 that you have done in F1.
Gen med will almost always be busy, quite a lot of surgical jobs will be too (more variable between hospitals). Some things like Paeds and O&G will be much more strenuous as an F2 than F1, as you will be on the SHO on-call rota, but this will also mean that you'd get more experience. A&E is always going to be hard work, and will involve a lot of shift work, but personally I think it's one of the most valuable rotations to do. GP is mostly quite relaxed, and obviously good if you're interested in GP, but often unbanded.
Really there aren't any that are universally great or universally awful, it's just what your preferences are.