When XPO moves ours , this will be my third employer with Fidelity over 20 years. I also have a pension and Roth IRA's with them.Visitor here. I’m at second employer with Fidelity. Assuming the options are similar, I’ve been content with Fidelity for over 30 years.
As far as I can tell , they have been a good company. They have ( so far ) had really long hours for customer service by phone , and I've even went to a physical location nearby to handle some business.
Between T. Rowe Price abd Fidelity , I personally have had more options with Fidelity. ( I don't know if that's because of the employer involved or the different plan administrators )