Debating Black Alum. ‘Cabin’ vs ‘Cabin Plus’ for carry on. Opinions?

I am headed to NYC and would like to pick up either the basic Cabin or the Cabin Plus. I am getting conflicting information, on the web, regarding the US Domestic airline’s restrictions. Ultimately, I would prefer the Plus (for volume) but do not want to be forced to check it. Seems the Rimowa online compatibility chart I nfo conflicts a little with some of the airlines restrictions. Similar, reviewing here, I have noticed some Silver Aluminum folks getting flagged but believe the fact that I am buying Black would appear slightly smaller to airport workers.

My question is: have any of we US Domestic travelers had any issues using the Plus as a carry-on. I typically fly in Business or First and understand that that sometimes relaxes the restriction, a bit.

Thanks in advance for any input and if you happen to have experienced both bags and want to weight in on the pluses or minuses of either, I would truly appreciate that insight too.