LMG! and Mana have already summed it up pretty well - but my opinion remains firm - one should never do a degree solely for the purposes of gaining entry into medicine. Having a feasible alternative career option from the degree you choose by far trumps the opportunity for higher marks.
Regarding marks, I'm not actually sure I agree re: it being easier to score highly in a theoretical vs practical based degree. Every degree is going to consist of assessments with "subjective" marking - you'll find there's plenty of those in a science degree too. It's easier for a person to achieve high marks when they're interested in what they're studying and are willing to apply themselves in the process - for many, actually applying the knowledge that they've gained in a practical sense helps consolidate learning and potentially leads to a more engaged student who achieves very highly in those practical assessments. One could even argue that science / medical science cohorts consist of a more competitive group of students (in the sense that the majority are aiming for very high marks to gain entry to medicine) which actually makes it harder to score highly within the cohort when compared with (for example) other allied health and non-health degrees, where most of the students are not aiming for medicine and are less likely to be going all out to achieve HDs in every assessment piece.
TLDR: Don't do a degree solely for the sake of medicine entry - it will likely result in wasted time and money, give you little to no opportunity for employment at the end of it, probably won't help much with achieving higher marks, and arguably offers less opportunity to grow both personally and professionally (which as Mana has pointed out, can actually impact on your interview abilities further down the line when it comes to medicine entry).
. you won't believe this but I am posting on behalf of my children, one in year 12 and one in Uni final year ,aiming for post Grad MD and DMD. Hope this is ok with MSO rules 
