Most manufacturers go with LPH.
Main point is to look at your build, see what you need with the fuel you're using, & the power you're making to decide between a 255, 300, 340 etc.
I also look at the manufacturers sites to see what amperage each pump could pull at a specific P.S.I. that way I'm ALMOST positive I'm not overloading my pump wiring.
I'm thinking a 255 lps fuel pump with 42lb injectors and a mild TT chip . Is there a recommended fuel pump brand name that has had great success? I have seen some negatives comments about the walbro but it seems to be a popular choice. Is TI a good choice? Any thoughts?