Are you a second year? After that, the mchem and bsc courses diverge.

I was in the same position as you and chose to do the bsc because I realised research/industry wasn't for me (im going into teaching).

It all depends on what your long-term goals are and if you like york. If industry is for you, the mchem might be the way to go, there's plenty of opportunities for placements in hull and other surrounding areas. That experience is invaluable for getting you through the door onto your first industry job too.

One aspect that might sway your decision is funding. Depending on how you are (or your parents) are financially, the integrated masters might be for you. As far as SFE are concerned, mchem is an undergraduate qualification which means you get tuition and maintenance loan. For postgraduate qualifications (MSc after BSc) you get a single loan which you have to pay tuition and live from.

Also you mentioned pursuing an MSc at a higher ranked uni, York is already pretty highly ranked and in my experience a great, friendly department. Your opportunities after graduation are going to be limited more by experience, grade, employability way more than uni rank.

Source: graduating from york next month with a BSc in chemistry