BM = Naruto's Chakra AND 50 % Kurama's Chakra.
Hence, BM?? < 100 % Kurama's Chakra??
IDK It could go either way because we haven't seen the entire potential of 100 % Kurama
Actually, 100 % Kurama has more chakra than Naruto W/ 50% Kurama
so chakra wise Kurama > Naruto
But in strength, SM+BM Naruto > 100 % Kurama