USPilot
Not to argue the non-monetary merits of either, but a new iCadet will, averaged over his first year, make about US$7000 a month, plus a few hundred in allowances (700-1000).
I think to earn the equivalent at JB, you're a few years up the ladder. Happy to be corrected, however.
JB does have the potential to be another US industry darling, a great lifestyle job or of course , be acquired by a legacy carrier. But, as it stands, career earnings there are substantially lower than a CX iCadet.