I'm a little torn on that one right there. I tried MCC 110 when I came back to photography and really like it. But I'm hard pressed to choose between it and MGIV FB. I do use MGWT FB when I want a warm tone and it's possibly the best paper I've ever used, but for my neutral tone prints I prefer the MCC 110. I think MGIV goes cooler in selenium and I like that versatility. I can happily use either paper really. But I want to support the black and white powerhouse of Ilford for all they do for black and white and for us, an I also want to support Fotoimpex and Adox for reviving old wonderful formulas like the MCC paper and the impending Polywarmtone and to support a small maker of black and white products.
I suppose I should just use whichever I prefer and not worry about that. Right now I have MCC 110 in stock so that will be it for a while. But the fact it doesn't come in larger quantity boxes means I have no great store of it. I have maybe a 24 sheet pack of 8x10, 30 sheets (five or so left plus an unopened pack) of 11x14 and one unopened but soon to be opened and used 25 sheet box of 16x20.
They are both excellent papers.