Definitely Chargepoint. Besides EA, they are the only one that offers "coast to coast" DCFC charging. They also manage an immense number of L2 charging stations. Handy to get a "good" parking spot in an otherwise crowded parking garage.
EVgo seems mostly concentrated in urban and suburban areas. I've used their units with the integrated CHAdeMO adapters a few times.
The others are more of an as needed basis. There is a road trip I'm taking this summer where a non-Tesla DCFC could come in handy one night. The three closest CCS/CHAdeMO sites are two Chargepoints and a Greenlots. (I'll likely be using one of the Chargepoints with a CHAdeMO adapter.)