Just got my WPI from BN today, very nice mixed easily, nice taste (bought Strawberry and Banana flavour, as I still have vanilla and chock from another brand that I will no longer be buying once it runs out).
Just get what you like, get WPC if your budget is tight, or get WPI if you have the extra $$$ for the higher grade, or get both and blend your own, at least you will know what you are getting.
Once my vanilla and chock run out I will be ordering them from BN as well as a bag of the Calcium Caseinate protein for night time use. (I still have some Max's Nite time protein that will be replaced), so just blend your own sustained release protein by blending WPI and/or WPC with Calcium Caseinate.
I am in the process of changing over to BN products as I run out of stuff, as the quality is better and the price is cheaper.
I only have different flavours (have four flovours ATM) as I like to mix it up, and if I look forward to my protein I will have it rather than hating it and making it a chore to take.
It's just protein no need to over complicate it.
I agree with that, as long as you get your protein you will be fine, don't get too confused or worried about it.