LBS MiM/INSEAD MiM /HEC MiM /ESCP/HSG Macfin

Luxury choice here... Did my studies at Bocconi and know plenty of people who attended all the schools you mentioned. I'll bite:

• LBS: has the best brand recognition globally of the pack, but the "London factor" is definitely oversold as you can easily land a LDN analyst gig from the others as well. Would probably make the most sense if (i) you want to immediately build out a larger friends network in the city and (ii) you are strongly set on banking & co given it's just 1 year
• HEC: good school, but (i) MiM/GE will be 2 years (assuming you don't take another gap year, then it becomes 3 years total), (ii) the first year will be a toned down version of what you already learned at Bocconi (if it matters at all for you) and (iii) campus is in the middle of nowhere. However, flexibility is a big perk given room to do summer internships & one potential further gap year if you realise M&A isn't for you, + double degrees & exchanges in year 2 if that can be of interest
• HSG: remove the "probably respected" as they are uber-elite everywhere in DACH. Don't know the school well enough to opine on MacFin vs MBF, but unless you are deadset on DACH, I wouldn't pick it over the others
• INSEAD: this is the wild card I guess, given programme is new. I have the perception that INSEAD has always been more of a consulting school and indeed I don't know any alumni in my bank (while there are tons of LBS/HEC/etc), but it's still a top school and you'd definitely progress through any CV screening. Imho you should see this as a twin program to the LBS MiM, with additional positives (life experience - living in Singapore is super cool and not something easy to do later in your life unless you are from SE Asia) and negatives (program is smaller as you said, so placement track record is yet to be proven to an extent... but we are really splitting hair here given it's INSEAD)

Unless you want to target DACH specifically, a sensible decision tree would likely look like:

• You realise during the gap year that M&A is what you want to do? Pick the 1-year master at LBS or INSEAD. Amongst the two, decide if you want to prioritise (i) already being in London and attending a known programme (LBS) or (ii) the life experience, while being fine with having to do some slightly additional legwork (INSEAD)
• Your gap year only further confuses your ideas on what to do after school and you're fine with taking your time before starting to work full time? Go with HEC

Re your Q1-Q2-Q3, don't think I'm positioned well enough to opine on any of them unfortunately. Hopefully someone else will be able.

The above is clearly only my 2 cents. You should try to get as many views - and at the end of the day, be relaxed in your decision, as they are all top schools.