1st answer: pick either. I have both cards. Dealer DCQC was a big and necessary infrastructure improvement. Though I've not used it yet, its very existence reassures me I won't be stranded, which makes Leaf a viable choice over PHEV. Both Chargepoint and EVgo are well run and well maintained networks. Going on either will be a further improvement. No more running around the dealership trying to find the magic fob, and trying to persuade uninformed employees that you're entitled to charge. No more waiting on a driver ahead of you who doesn't really need the charge but wants to save $1 of home electricity. Just like other Chargepoint and EVgo stations, you have the card, you quickly and easily start the charger, you pay for your charge, and you're entitled to charge, no questions asked.
Personally I'd prefer you pick EVgo. That's because I'm in San Diego where EVgo is on the verge of building a viable network for which I'd pay a subscription fee. The more stations which join EVgo the greater the value of my subscription. Especially valuable would be stations in Los Angeles where EVgo barely has a toehold, whose presence would facilitate "in network roaming".
If I lived in Los Angeles where Chargepoint is ubiquitous I'd hope for San Diego dealers to pick Chargepoint for the same reason.
From a public policy standpoint I'd hope that dealers everywhere would pick whichever network has the lesser presence in their area, to promote competition. With Blink seeming not very interested in maintaining and running their network, whatever competition there is will be between Chargepoint and EVgo. It would be unfortunate if they ended up with a de facto division of the market, like cable TV companies, with no restraint on price increases and service decreases.