Hi, I have an acceptance for MBA from Grenoble ecole de management and also from Cardiff University for MBA with AI and from Queens University Belfast for MBA, I have 5 years experience with IT industry.
Am bit confused on which country to choose, should I be choosing UK or France, where are the better job opportunities after completing MBA

I assume you cannot work in French at a professional level, and thus think you can exclude France regardless of the opportunities there for those who do. See: 

Do you need to speak the local language? www.find-mba.com/board/34713

Obviously neither Cardiff nor Queen's has MBAs that are highly valued in the UK market. If your budget is limited, an MSc at a better school would be a wiser investment. 
See: Best MBAs for international students' placement http://www.find-mba.com/board/41143 and https://find-mba.com/board/general-forum/best-msc-mim-degrees-for-international-students-placement-52915 

Does MSc in management has better opportunities than MBA?
Am okay to learn French and work in France 

An MSc in management from a good school has better opportunities than an MBA from an average school. 
If you are okay to learn French, do that and then take a MSc taught in French. 

Also see:


Which MSc's are better than pre-experience 'Freshers' MBAs? www.find-mba.com/board/22783
and Why freshers' MBAs are worse than MiM degrees from better schools http://www.find-mba.com/board/38133

Cardiff is no longer a freshers MBA, I think, but it's still aimed at people returning to India. 

Yeah but am not looking for freshers MBA because I have an experience of 5 years in IT, To climb up the ladder in corporate industry I decided to choose MBA over MSc.
What do you suggest here? 

I suggest you refine your goals to something more specific and apply to much better business schools if you want a role with a firm that hires from much better schools.