Dual spectrum or standard hps ?

Ok so dual spectrum bulbs are clearly better for veg but I have seen various opinions on the flowering stage.

Has anyone had the oportunity ton do a comparitive grow using the same strain ?

Would love some feedback

Would be best if you do a search on this in the forums... This subject has a ton of writing on which is best.
There a lot of options and many work good to very good. I've even began mixing in metal halide with hps during flowering due to some of my reading here.