Youll never get the clear simple answer you want here it's just all about how you look at it.
There'll be those who argue the MCAT carries more weight
1) Past a 3.75, by and large GPA increases have diminishing returns. 3.7 is the median GPA for MD matriculants. 31 is the median MCAT for MD matriculants. There sure aren't diminishing returns past a 31 on the MCAT like a 3.7. Look at top school admission: a 3.7-3.75/37 type applicant can certainly have a shot at being competitive. Someone with 4.0/31? They're largely just donating money applying to top 20 schools.
2) Top MCAT scores are alot less common than top GPAs. The MCAT in many ways stratifies an applicant pool. It standardizes it as well.
3) Nobody really pays attention or cares about specific school median GPA stats. They sure do about median MCAT stats and schools when they look to boost their stats aren't doing so by trying to boost their GPA averages, they are doing so by trying to find people with big MCAT scores
4) Generally speaking while neither GPA or MCAT is a good direct predictor of med school performance, the MCAT trumps GPA in that regard.
And then on the other hand there'll be people who'll argue the GPA carries more weight
1) If you go through
LizzyM score analysis, by and large someone with the same LizzyM score but who's GPA contributes to it more than the MCAT often historical norms shows has a slightly chance of acceptance. In other words historical norms show a 3.9/31 tends to have slightly more success than a 3.5/35.
2) Likewise you'll have people who believe one test isnt as good an indication of someone's aptitude or skills as 4 years of college work.
3) Those AAMC surveys show that sGPA is given a ever so slightly higher importance rating than MCAT.
4) While I dont agree with this there are people who think the MCAT is a test that can be studied for and "gamed" to be beaten to an extent with some people being at an advantage due to things such as SES amongst other factors. Similar to the idea that the rich get their own private tutors and expensive prep classes.
Grade trend is the other significant variable here. A 3.4/35 with 4 most recent semesters of 3.9 work is far different than a flat 3.4.
All in all if it wasn't obvious enough YMMV. Both a 3.5/33 and 3.9/30 can get in just fine, however a 3.5/33 is a bit more discordant.