When it comes down to it, its about your personal preferences as a student - no one can tell you that you will/won't like anything.
But, in general:
Chemistry is far more practical - I did at least one experiment a week. Essentially no algebra is involved. Also, 2 of the options(forensic and biochem) would be harder for not having done biology.
Physics is far more abstract, you will be thinking about concepts and fundamental laws more than doing anything practical - I remember only doing a handful of meaninful experiments. You will also have to fiddle with algebra, and maybe some basic trig and this would be harder if you didn't do any maths and fell out of practice IMO.
The exams for me weren't that different in difficulty, and again this varies from person to person and same with the workload.
So if you are really hands on and interested in what is around you then chem might be better, but if you like to be more theoretical and look at how things happen instead then go for physics.