I reckon the Alpine will be more similar to the SS than the BFe would be.
I had an Alpine, it was class for DH and ok for xc stuff but a bit short for me. Only downer was the highish BB, also the stays were quite long so nice and stable but not as much fun as my old dmr for larking about on.
The BFe feels a bit more nimble but the back end feels a fair bit stiffer, the Alpine was comfier. the BFe is maybe a touch steeper but hard to tell, the bb is noticeably lower and I like the shorter stays. Maybe not as solid on the downhills though but a bit better for jumps n that.
Dont know what else to add, that was dull. The Alpines paint job is more solid than the Cotics though