There are so many individual variables involved that there is no one "best" route (to RN licensure). I would encourage you to talk to "live people" at
all the nursing programs in your area (ADN, traditional BSN, accelerated BSN (if there is one)), find out what they have to say about how competitive a candidate you would be, how much of your previous coursework would transfer in to meet their requirements, what the time frame for completion would be, costs, scheduling, etc., and then spend some time puzzling out which is the best option for
you in
your specific circumstances.
Lots of people will tell you that anyone who already has a BA/BS "should" go to an accelerated BSN (ABSN) program, but that's not necessarily true. Those programs tend to be comparatively expensive compared to other nursing programs, and they are extremely fast-paced and intense -- which might be great for some people, but a poor choice for others. If a lot of your previous coursework would transfer in to meet the requirements in a traditional BSN program, you might well be able to complete just the nursing courses of a traditional BSN program in not much more time (than an ABSN program) and possibly save a lot of $$$. Ditto for an ADN. Or, you might find, after investigating, that you are best off with the ABSN program. All other things being equal, you'll be better off, in terms of growth and options within the field once you're
in it, with a BSN than an ADN, so, if it turned out that you could get a BSN in about the same amount of time, for about the same amount of $$$, as you could an ADN, I'd encourage you to go for the BSN.
Some employers consider an ADN + BA/BS (in something else) the equivalent of a BSN degree for their own, internal purposes (promotion, management positions, etc); many employers (and graduate schools)
don't. BSN curricula include specific nursing content that ADN curricula don't, and a baccalaureate degree in another field doesn't change the fact that you haven't had that additional BSN-level content/experience.
My point is 
, the "best" option is going to be different for everyone. Whichever route you end up going, you're going to invest a whole lot of time, effort, and $$$, so it's well worth putting in the extra effort up front to be sure you're making the right, best choice for you.
As for your other questions, most people with previous degrees (and there are plenty of other threads here about this!

) are v. disappointed to find that their previous degrees don't benefit them in beginning a nursing career. Basically,
no one's going to care that you have another degree; a new grad (in nursing) is a new grad is a new grad. However, it may be of benefit to you as you move forward in your nursing career over time.
I'm not sure what you mean by "What do employers think of RN to MSN graduates?" If you want to clarify what you're asking, I'd be happy to offer an opinion. Best wishes!