The wash at the end is to remove any traces of NaOH suspended in the solvent, see here:
The Base in Your Product The inclusion or not of an acid soak phase at the begining of the tek has no bearing on the need to do that wash, as basing requires you reach a strongly alkaline ph of 12 or more in either tek, and it's the remains of this solution that the water wash removes.
I don't think that, done properly, there''s much difference at all in quantity of product between the two. Quality wise it is supposed tthat STB can tend to produce more of the yellow waxy or oily polymorph of DMT due to longer exposure time of the freebase DMT to the strong alkaline solution, since the NaOH is used to break down plant material too.
But I've only picked that idea up from reading here, I've not tried to test it. I'm pretty sure that the oily polymorph is just as active too, but its different vaporisation temperature can result in a need to tune the delivery method differently and result in some claims that it's not as active as white fluffy DMT.
The yellow is also a lot denser than white, leading to dosing variation if not being careful.
The process from extraction to delivery has a few subtleties that affect the outcome slightly, but there's not much you can do to completely fail if you follow a tek reasonably well. It *is* quite easy to burn up your product by overheating it during administration though, so it's tricky to control for stability at either end of the process and determine what is making any difference in experience. ... oh and you have to throw into the ring the fact that psychedelic experiences depend strongly on "set and setting" so the whole "quality" metric is a tricky one!
Anyway all the above is to say that both methods work substantially the same, and as the aim is to get enough DMT for a personal experience then either will do. Don't fall into the over optimisation trap and keep an eye on the purpose of all this
Personally, I use cyb's hybrid AtoB
Cybs' Hybrid ATB 'Salt' Tek - DMT-Nexus Wiki which is easy to perform and requires nothing in the way of filtering equipment.