the best by far is harts for a competition only injector. there qc, there tolerances, the dyno work that goes behind them. there doing some unconventional things and making huge power.
weve had em all in our puller (jl, schied, various companys extrude hones) and the harts just run better. directly comparing them to a set of jl and schied 5X.025 the hone size was much more consistant, the pop'd much cleaner and more consistant, and most important made alot more power.
now for a street truck that also competes (dyno, drag, lower classes of pulling) DDP makes a nice 12v injector that will make good power. but comparing them to a harts injector is like comparing a 11 sec bracket racing car to a 6 sec pro mod