As long as the T you swap to, is as good as the original T (or better) - what are the pros and cons of changing?

I find the relationship with my T really difficult and put it down to my stuff and my inability to trust people - however what if, instead it is because my T isn't the best T for me and how would I know that - this is the only T I have ever had and for all I know could be the very best or one of the worse, as I have nothing to compare it against how would I know?

What are the advantages of staying with the same T?

I am realising I have an issue with showing absolute loyalty to people to the extent I get walked over and on occasions abused - so I am very confused whether I keep seeing the same T, because we are working well together, or because I just feel loyal to him.

All very confusing stuff in my head right now - any pearls of wisdom greatly appreciated - thanks - Soup