What you currently using? 5T? How long do you typically keep your phones for?
8 Pro is a beast of a device! Love it and would jump on it in a sec but 2020 happened and my 7 Pro is still going super strong, so......!
There's not a huge difference between the 2 mind you, 8 Pro does have wireless charging and IP68 rating. Improved camera optics is probably the area most would place a premium on. Increased battery capacity and 865 Snapdragon an incremental improvement over the 855+... 8 Pro's screen is highly rated too, but not sure how significant a difference there would be with the 2 handsets side by side..
And then there's 5G... with MTN rolling out 5G it won't hurt having a handset that can take advantage of this technology!
Wonder what the price difference between the 2 works out to? If it works out to less than say 25%, I'd say go 8 Pro... If you can save a chunk of change then maybe 7T Pro... and if you plan on upgrading again within 12 - 18 months....