I actually quite like the large ones, but then again I've got a pretty boss face and some muscular mass around the body so I feel like I could pull it off :p I've got alright shoulders - not too slim or borderline scrawny so I feel like these peak lapels still suit me fine. If your shoulders are noticeably slim (severely lacks the v shape upper body that some men aspire to or pretty much exactly in line with your waist sides), I'd go for the slimmer ones, if you're thinking of going a bit more towards the fashionable side. The other option is go with the notch which is just universally great.
Oscar Hunt's overall fit is pretty much on the general side - you can go with no break on the pants and ask the fitter to slim it overall, which should be slim enough otherwise it'll bunch or pull at the fork. With the jacket though honestly if it fits then it fits, you can ask to taper the waist ever so slightly more to create a slimming effect but that's about it.In fact I don't know if there are that many options for slimming the jacket in general, even at other tailors, usually there's just that one accurate, nail on the coffin fit.
I would always try RTW suits for a less formal occasions. Unless you have a wardrobe with 20+ bespoke / mtm suits. Also lot of the time mtm/ bespoke don't get it right at the first time. I would try mj bale drop 8 suits first. They have many pick lapel suits. Or even suit supply. Have multiple RTW suits, find out what really suits you before spending big on mtm/ bespoke. FYI I am quite skinny 5'10" and 51-51 kg suit supply 34r firs well and mj bale drop 8 fits with very minimal alterations.
Yeah I see your point, but I still feel like a MTM process, I feel like there's too much of a hassle with RTW and just the uncertainty around it... but that might be just me.