This decision drives me crazy. My situation:
-my iMac 27 2013 i7 died few months ago (GPU failure);
-now I use Macbook Pro 15 (2015), which is substitute of failed iMac but only in part (Internet, Office - it's to weak to carry my audio works);
-I have a lot of software for Intel iMac: for example audio production software (Native Instruments Komplete Ultimate, Propellerhead Reason, Presonus Studio One, a lot of VST and synths etc etc);
- I'am afraid: a) many vendors will not re-release ARM software versions I already have; b) even if they release, I will have to pay again.
So, please give me advice: to buy Intel iMac 2020 or wait for ARM?
Thanks in advance!
I'm not particularly in the market for that particular Intel Mac, but I am in the market for an Intel Mac. For me, it's all about Boot Camp ability and x86 virtualization (we'll get the ability to virtualize other ARM architecture OSes in droves on Apple Silicon, but it doesn't help when all of the OSes that I want to virtualize are x86-64 only and likely to stay that way for the foreseeable future).
That being said, since you are on the Mac platform (and not on Windows), the likelihood of your older software working with future Intel releases of macOS will gradually diminish. Even if it still runs, you may find that it runs in a reduced capacity. You won't have this problem as severely with macOS as older oft-neglected iOS apps have on newer releases of iOS/iPadOS. But it's much more of a potential issue on macOS than it is on Windows (where stability and backwards compatibility are much bigger priorities when pushing that platform forward than it is for Apple with macOS). All that to say that your need to buy newer versions of your software is inevitable.
Do I think you'll need to do this imminently? No. If forestalling the inevitable repurchasing of your apps is important to you, then getting a 2020 Intel based 27" iMac now might be the best course of action as, by the time you get ready to naturally replace that machine with an Apple Silicon successor, you'll know much more about what to expect regarding the Apple Silicon/Universal Binary 2 versions of your apps.
THAT BEING SAID: The lower-end Macs are likely making the jump to Apple Silicon first. The 21.5" iMac not having been updated at the same time as the 27" iMac (which, barring the transition to 4K and 5K Retina displays, has never happened in the iMac's long history of having multiple display sizes) is telling. It will likely make the jump first, along with a host of other lower-end Macs (MacBook Air, 13" MacBook Pro, and possibly Mac mini as well). All that to say that the likelihood is strong that there will be other Apple Silicon Macs that are getting released safely before the 2020 Intel 27" iMac gets discontinued. All that to say that you will likely know, at the very least, much more about how your current Intel software runs under Rosetta 2 (as there will be Macs in the wild that can do so). For all we know, it may run smooth enough for you to transition to Apple Silicon Macs before having to upgrade your software.
I'd advise checking with your software vendors though. It's not unreasonable to ask whether or not you'll get patches or whether you'll have to shell out four figure amounts for whole new versions things.