iPad Pro is my fav device, but I am definitely jealous of the DeX on Samsung S7+ series. Samsung S7+ is a great device too, but it's biggest flow, which is not really Samsung's mistake, is the lack of Android Tablet Software support compared the ones on iPad Pro. Even on iPad Pro there isn't much pro apps, I mean still the publishing/mise-en-page is not well covered lacking softwares like inDesign or Affinity Publisher and also on 3D modelling there is some long way to go.
I should admit that I envy you having both S7+ and iPad Pro, I think that it is a winning combo.
Enjoy!
Yeah, they are extremely complementary. Having both is great. The S7+ is a much better video watching device (oled, better aspect ratio, better sound, lighter, can connect and disconnet to a monitor and will continue play the video on the monitor when connected at the proter aspect ratio, without buying additional apps and while still having the tablet available) while iPad is better for portrait viewing PDFs or for some pro apps like lumafusion, drawing apps (but I am not an artist) and music making apps (Samsung gives you 6 months free of Clip Studio and Canvas free, but there are not many apps otherwise and for music there is almost nothing).
Samsung is much more powerful for multitasking but to be honest, I mainly multitask on windows anyway... The trackpad also is not as good as on the magic keyboard, but I don't use it as a laptop so I don't care...
For many things they are equivalent (google and microsoft apps, streaming, notetaking and pdf, but I have to say with the Samsung it's almost all free, while with iPad you need to buy additional stuff (note taking, annotating pdf etc.) or it's more expensive (using is as a second monitor with pen for windows requires a $30 annual subscription vs $10 one off on Android with Superdisplay, and it works amazingly well). But again some apps are better and cheaper on iPads, like lumafusion or procreate.
Also, the price of upgrades is much cheaper with Samung, going from 128GB 6GB RAM to 256 8GB RAM is on $70 more, and you can put 1TB microsd (I put a 512 GB microsd I bought for $65).