If you like Phineas Cole stuff either one of them can do that very well. I would start with the basics, type of lapels, slanted pockets, ticket pocket, how long you want the jacket and how structured you want the chest and shoulders.
I personally, would not buy any suit made in a super over 120's. Generally, and there are exceptions higher super numbers means soft and luxe, however they don't hold up as well. Either Ercole or Frank can guide you through that. I would honestly ask them about what fabrics you should get. There is the unfunded liabilities thread for talking about fabrics and there is just too much to go on about in brevity.
Also, I suggest you don't get an extreme suit as your first bespoke suit. Get a solid navy or charcoal conservatively styled suit.
By the way if you like that grey suit at the beginning of this thread, I am actually selling it on B&S...