HSI Investigative Opportunities

Currently in process with HSI and just applied to ATF as well. I was curious on HSI’s ability to investigate firearms crime/gangs not on the SW border? Or the possibility of getting assigned to ATF as a TFO? That’s truly what I want to investigate currently(hence applying for ATF) but that could change over time which makes HSI more attractive as they investigate several different things. Plus HSI seems to abbreviate the hiring process for laterals.