BSN Syntha 6 has much more carbs, that is why it has lesser servings.

You need to compare entire macro nutrition profile + ingredients.

They are all okay. It's a matter whether you use it right.
And like I said before, you need to compare the nutrition profile and ingredient list.

Many things can be labelled as '8 hour long lasting protein'. Just because it is labelled like that does not mean that the general public cannot use it. Again, you need to compare the ingredient list, at least the protein part to know what you are really consuming.

I believe MP Combat is spiked with some amino acids to raise the protein count during testing and therefore in actual gives a lesser real protein count. There's a discussion on spiked proteins somewhere in this section.

You need to read the ingredient label. There are tons of threads in bodybuilding.com that talks about spiking, also lots of articles on the web, and there's one thread somewhere here in this section.

It's because whey prices are always increasing each year.
Our currency has gone down a lot compared to USD.
GST.

Repped.

When you gonna hook me up with one of those Max Outs