FO with Slang vs BO with modern tech

I have to choose between two groups at Goldman Sachs. One is a back office technology group with no exposure to the finance side, but uses modern tech stack like Java & JavaScript & AWS & MongoDB. Another is a front office strats group that works frequently with front office finance people, but uses a lot of Slang and bespoke products. Which one should I choose if I want a better career growth and exit opportunities into big tech & hedge funds ? TC: 110k + unknown bonus YoE: 0