Racers - 1 piece vs 2 piece? Comparison inside

Question for the racers, although trackday riders feel free to chime in if you have experience.I've been doing trackdays for over a year, and usually am in the intermediate or advanced group. I'm looking to race this season, and get the impression that most people are only running 1 pieces in races.I've got a 2 piece I've used that's on the way out, but am upgrading to the A* Tech Air system.Is this combo, really that different protection wise than the 1 piece?JACKET https://www.revzilla.com/motorcycle/alpinestars-missile-air-leather-jacket-for-tech-air-racePANTS https://www.revzilla.com/motorcycle/alpinestars-missile-airflow-pantsKNEE https://www.revzilla.com/motorcycle/forcefield-pro-tube-x-v-21 piece equivalent:https://www.revzilla.com/motorcycle/alpinestars-missile-race-suit-for-tech-air-raceThe only difference I can see is the 1 piece has an additional armor placement in the knee area, which I have the forcefield piece for.Considering how much I'm spending on the tech airbag, I figure I'll get a lot more use out of it in a jacket vs a 1 piece which I may not wear all the time. Plus, for me at least, probably better sizing as I tend to need a more custom fit.Is the safety difference big enough to only go 1 piece for racing? via /r/Trackdays https://www.reddit.com/r/Trackdays/comments/8rcscc/racers_1_piece_vs_2_piece_comparison_inside/?utm_source=ifttt