ORIGINAL: Incredible Bulk
90+ has a great reputation amongst members here on MT, why are you thinking of shifting over to a different one?
Isolate is a purer form of protein compared to concentrate but the price difference between the two reflects that.
If you have the budget, i'd go for isolate
The best protein on the market in my opinon is from the CNP range
http://www.bodybuildingwarehouse.co.uk/pro-peptide-227kg---advanced-multi-protein-blend-26-p.asp
If your looking for a good whey isolate why not stick with 90+ as you cant go far wrong
http://www.bodybuildingwarehouse.co.uk/nutrisport-90-protein-powder---5kg-413-p.asp
I'd disagree with the advice to get isolate. I'd personally say that unless you're lactose intolerant then concentrate is the superior protein, based on the fact that the further stage of filtration that you put a concentrate through to achieve an isolate (microfiltration), also removes most of the growth factors (concentrate has upto 800%more).
These growth factors such as IGF-1, IGF-2, FGF etc, whilst in the short term may not exert any noticable effect...like most things, over the coarse of a year, may contribute to improved health such as better wound healing, and gut integrity. It's also plausible that they may contribute to increased LBM over time as well.
Personally I'd just pick a concentrate from one of the bulk suppliers, and save some money. Or if you're the type of person who prefers a branded product, then go for a reputable whey blend, as that will still be predominantly concentrate, with isolate added primarily to bump up the protein content....to compensate for addition of flavourings.
Just to clarify as the use of jargon can be used to obfuscate the issue...
sweet dairy whey undergoes
ultrafiltration - which removes most of the fat and lactose - to produce a concentrate
Concentrate undergoes further processing via
microfiltration or
cross flow microfiltration to further remove the remaining lactose and fat. But this also removes nearly all of the growth factors as they're contained within the fat globule.
There is a third process that can produce an isolate known as ion-exchange...but this is an obsolete method (or should be).
<message edited by orinoco on 05 July 2008 20:29>