Chiming in on this somewhat old thread: I'm a heavy user of Office (mostly Word and Excel). I use them on both a lower-end Windows desktop (Core i5-6600 running Windows 10) and a relatively high-end Mac (core i9-9900K iMac running Monterey). Based on their relative GeekBench 6 single-core speeds, the Mac should be ~ 1643/1269 => 30% faster. Thus I find it annoying that, even with the difference in hardware performance, Office is faster and more responsive on my modest Windows computer than on my relatively fast iMac. Plus the Mac is at my desk, while I access the Windows machine via Remote Desktop!
Interesting. I have used Office on an M1 MBP, Windows via VM on M!, and an HP Envy with a mid range AMD chip. The VM and Envy had nearly the same GeekBench scores; and I never noticed any performance differences between the M1 and HP in terms of responsiveness.
The biggest problem I have with Office, whether Windows or Mac, is unreliable integration between Word and Excel. For example, I created a document that uses Excel to analyze data and create charts and the Word with links to the charts and data to create a document. Sometimes the document updates properly when the Excel file is updated and other times it comes out a hot mess.
*Though I can compare them qualitatively: I often experience spinning beacballs when working with Excel in Mac. I can't recall experiencing similar delays with Excel in Windows.
Anecdotally, I have done some Excel work involving numerous tabs with lots of formula references to other tabs, significant amount of conditional formatting, graphs, calculations, and VBA and haven't run into spinning beachballs. Not doubting you do, and I suspect it's a function of how each person uses Office. As the saying goes, YMMV.
In addition, Office for Windows has more functionality than Office for Mac. I've made a few posts on the Microsoft Forums where I've been told the function I'm looking for is available on the PC version but not the Mac version.
Full feature parity, especially add-ins, would be nice.
For me, making Excel Live compatible with macros would be a huge step.