I think it has more to do with YOUR style. Which do you think YOU could follow through with?
Personally I tend to like PRT, RDI and ABA-VB (verbal behavior) better as the therapist tend to work on a wider variety of skills and really work on generalization from day one. These approaches are also easier for parents to implement and carry over.
That said what it comes down to is the individual working with you and your family. I would ask for a meeting to talk with each company if you can and if you can bring your child (just to gauge their intereaction with him, but try to bring things for him to occupy himself ;))
One thing I will say as a professional (I teach a self-contained preschool Autism class) is that the assessment they use can tell you a lot. VB-MAPP is much better than even the latest updated ABLLS-R...make sure that the company does use one of these formal assessments on at least a (officially) yearly basis. ABLLS-R is (in my opinion) is "splinter skills", where as VB-MAPP is actually norm and age referred developmental skills.

I think it depends on what style they learn better from. They have done the mass trials with my daughter and had to switch to more play based as she learns better that way. It just depends.

My son is 2 and received PRT for 4 months. He has made vast improvements! I think you will see improvements with both, speak w the BCBAs this may help you sense who can help your child bette ans who is eager to help your child. Not just make money off you.

I think that it may depend on his level. Discreet trial was too simple for my son --he memorized it but didn't apply it. Or he didn't generalize....

All gonna be vastly different even if have same title of description.gonna take few months to find the PERSON that does anything worthwhile.keep at it and you will.Xo