Yes they are considered better as with the spray bar there is one small outlet from the oil pump which is then split into 4, oil jets get oil directly from the main oil way in the block. In the GrpA / WRC engines they also fed oil into it from where the standard oil pressure switch is to even out the oil flow to the rear journals and oil jets. Nothing wrong with the spray bar setup they are used in monster power engines but if i was building one from scratch i would opt for the oil squirters.

I guess manufacturing costs also play a part in why ford (and most manufacturers) went this way as there must be some labour involved in making the spray bars compared to the oil squirters, and the ST engine used a pinto oil pump which is alot simpler and cheaper to make.