Well, looking at the selection ranks for ACU and WSU - biomedical science has a selection rank of 60.95 (ACU) and medical science has a selection rank of 71.90 (WSU). Though this should not make a difference in transferring in my opinion if you perform well compared to your cohort. In my opinion, WSU is more well known and has more students, but university should not matter if you can maintain a distinction average (75+ WAM). However, I suspect both courses will not allow you to transfer many units of credit - I've heard it could be only 1 subject transferred in a 9 subject year for the Sciences. So when enrolling for your courses, enrol in biomedical courses, obviously, just in case it's transferrable and to get a feel for it, but don't swamp yourself with purely biomedical courses - take some fun, free electives.
Personally, I'd say to choose the university that you like best. There should be O-weeks at those universities - see if you can attend those. Reputation may be of importance, but it's no use going to a university that you don't like. Also consider travel time and contact hours at each of these universities.
Also, have you considered going to UTS? They offer a Bachelor of Science (with majors in Biomedical Science) for a LSR of 76.30.