I would choose T2 because I am of the philosophy that I do not want to be in therapy forever and I want to get better as quickly as possible. Just my opinion but if you've seen progress and insight from the new therapist already and you've been working with the old therapist for over a year I just would think how much progress can I make if I continue with T2. If it were me I would try T2 for a while you can always go back if it doesn't work out.