Went to bhhs

, and know people who went to John Monash, so hopefully I can give my opinions.
In my opinion, if you are good enough to get into BHHS SEAL, then you certainly very probably good enough to get into John Monash, so getting in does not mean much. (getting into either in my opinion isn't that competitive)
In my experience, the mainstreams at BHHS are not strong at all, and the % of scores 40+ for SEAL students is actually 32% (according to a SEAL program presentation by BHHS). From this, the cohort of seal students at bhhs is likely to be stronger than John Monash, and including mainstreams slightly worse than BHHS. Although, mainstream might be getting a bit stronger now since Box Hill now gets decent results, making the SEAL program more competitive to get into.
John Monash is strong in the maths and science department. I haven't heard good things about the English department at John Monash, and it's definitely a bad idea to go to John Monash and take humanities subjects for VCE. Most students there only take humanities subjects as bludge, which means that you will only have yourself to rely on. I think the teachers are only slightly better at John Monash for math and science subjects, but BHHS has gotten some new teachers last year and this year (for chem, physics, maths etc.) so it's hard to tell.
The VCE program at BHHS is better than John Monash as you can take 2 'heavy' (think Methods+Physics combo) year 12 subjects a year early and afaik you can only take one at John Monash. Are you able to do Biology 3/4 next year as well? I think they stopped letting students do that.
The thing to consider is location, If you live much closer to Box Hill than Clayton, then I think the decision is a bit more obvious.
Have you thought about what subjects you are interested in doing for VCE? What 1/2 subjects are you going to be doing?
Hope this helped
