Hi
I have an open degree (with credit transfer) and for most employers, because you need to include modules studied, it won't be a disadvantage. Sometimes, it can even help, as I've been able to dress my degree as one of three subjects due to the variety of modules taken. However, it can be a pain explaining the degree on applications (not necessarily a disadvantage - just a nuisance!)
There has only been one time that I was flatly refused/rejected for having an open degree (to do a PGCE), but I think that's more a reflection of the uni I was applying to.
Incidentally, if you apply for one of those options, you can change the programme later on. Have a look at the modules you fancy, and base your choice on that. (For some level 2 and 3 modules, there might be prerequisites, but your previous study will be taken into consideration, but that's also something to think about.)