I think the boost-a-pump is simply an easier install. The addition in the line seems simple. To upgrade to full twin pumps isn't required unless a serious amount of fuel is needed, and that is also more expensive.
For that I'd think you will need to upgrade the in-tank pump setup. I don't think a boost-a-pump will make up for the stock pump in that case. When it comes to fueling a boosted car, better to have too much fuel system than too little, right?
Yeah i understand that, I was going to either run two fpdm with twin pumps or a single modified fpdm and twin pump set up with two 340 LPG pumps -8 line and areomotive fuel rails to a set of id1000 injectors just wasent sure what power set up would be better the two fpdm or the modified one fpdm with a boost a pump. Since I've seen people run that setup too just trying to see what set up is more reliable