Which is better? Nvidia GT750m sli/no sli or GT755m sli/no sli?

I have a Lenovo IdeaPad Y510p with a GT755m (No sli) and noticed when I would play Minecraft the fps would be up to 30+ but rarely above 48 fps unlike in most reviews I saw. The reviews would show it at 60-120 fps.

I noticed that the reviews had GT750m in the specs. But then I see about 4 reviews where the GT755m is said to be great.

My CPU is an Intel Core i7-4700MQ 4th generation.
Also my current RAM installation is 8GB (Up to 16GB)

I'd like a legitimate and honest answer as this really confuses me
If the GPU isn't the problem then please explain what else is doing this.

GT755m is noticeably better than the 750. And the 750Msli is better than the single 755m.

PS. The reviews are over exaggerated. It's just placebo affect.

I suggest looking at some benchmark tests for the cards in question. As it is unlikely that anyone here will have used both of those cards in both of those configurations, any responses you get will be a guess based upon ignorance and assumption or perhaps a certain amount of knowledge but still a hefty dose of assumption, where as benchmark tests will give you qualitative and quantitative results you can reliably compare.