By 2020 I could be getting a new iMac, iPad, and iPhone. Is using this card the best option for buying those?
No.
You could get something like a
Bank of America Cash Rewards card and get the same
3% off any and all online purchases + a $200 credit for spending more than $1000 in your first 3 months of ownership + 0% APR for 15 months.
Honestly, BoA CR is the probably THE card to have for cashback since you can apply the 3% off to anything you buy online, never mind the $200 bonus and 0% APR.
Discover It right now is also extremely good.
5% off at all Restaurants + any PayPal transactions up to $75 through the end of the month ($2500 spend). Then Oct - Dec will be
5% off on all Amazon, Target, and Walmart.com purchases up to $75 (or $2500 spend from Oct-Dec).
That said, if you don't have either of those cards, don't want to apply for either and only have an Apple Card...then yes, you should use the Apple Card.
I can pretty comfortably recommend Discover It and BoA Cash Rewards to everyone. iPhone app integration isn't as seamless and you don't get the cash back instantly, but the $200 bonus offer is just a superior offer when it comes down to the dollars and
sense of it all and 0% APR for 15 months is pretty big given the Apple Card doesn't offer any 0% APR months at all.