Go true to size. (ie: I am a true size 9.5, so I buy my 574s in a size 9.5)
As of right now (Q1 2023), the 574 DOES come in wider sizes (in certain colorways).
Comfort Factor Ratings:
Cushioning (Softness): 5/10
Stability (Firmness): 7/10
Cushioning to Stability Ratio: 5:7
Midsole Shape (Foot support): 5/10
The 574 is ok in terms of comfort. It has solid support and stability, but only a decent amount of cushioning.
The ENCAP utilized in the 574 provides a good amount of stability, support, and some cushioning. Unfortunately, the combination of a flat midsole/outsole shape and a foam that is not too soft means that the 574 is not as comfortable as the 990 series of shoes.