If you are an IB user and need/want the sort of technology IB offers for equity execution, you are not a candidate for Fidelity.
Essentially, IB is selling their very good execution platform.
If you want more than just a platform, the Fidelity Active Trader package/product is very impressive. Great technology, very good execution, and nice tools. And they support their client base, which can be worth a bundle when you have questions, problems, etc.
Opening an account at Fidelity is like trying to get something done with the government, but once that is behind you, it is behind you.