Right now I only have the CSP for the SUB (plan on cancelling after the year is up,) but I also travel a few times a year - enough that I feel comfortable being able to use the $300 somehow most years, and that I’m willing to do that for lounge access. My comment was more thinking to a point where if I was only traveling (at least by air) only once a year - and at that point I’d prefer a simpler, less credit-based setup. Although at that point I might just go completely no-annual fee, using Bilt to get some Hyatt points (since they have a lot of decent sweet spots) and then cash-back cards for the rest.
One big thing to note is that the Cap1 portal doesn’t have every hotel listed. They do have a lot, but I have a stay coming up that I couldn’t book through them and so had to book it through Expedia. Cap1 also won’t price match member rates, which most chain hotels have, so it’s quite possible that someone would pay more on the Cap1 portal vs. a direct booking.
SUB = sign up bonus.
Realistically, for international business class travel, unless you’re spending high-five-figures each year through a card (at minimum) you’ll likely need to supplement everyday earnings with one or two large sign-up bonuses each year. I haven’t dug into international business class redemptions personally as they’re often quite expensive and/or require a lot of flexibility and positioning (at least from my home airport, MSP) and so hopefully either someone else can provide more insight on that aspect as to which cards have the best transfer partners on that front.
That said, I don’t think you can go wrong by starting with a CSP + CFF setup, probably adding in the Unlimited for the 1.5x base earnings on unbonused spend. Cap1’s transfer partners are a bit more lucrative, but from my reading they also are more difficult to book/use (e.g. Turkish has cheap rates but for partner rewards may require calling in or emailing a bunch of ticketing offices - I’ve never done this but I’ve read about it on Flyertalk.) Chase has many decent ones, and most are relatively easy to use.