Unless you really want to play around with LiDAR.

With iOS 13.4 on the way later today and the iPad Pro set to begin shipping Wednesday, early reviews are beginning to trickle in for Apple’s new tablet and the impressions make it perfectly clear: The new iPad Pro is great but there’s no need to rush to upgrade if you have the previous model. The main appeal is trackpad support, but Apple is bringing that to older models, too. And the new Magic Keyboard—which isn’t available until May—works perfectly fine with the 2018 iPad Pro.
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https://www.macworld.com/article/3534017/2020-ipad-pro-review-roundup-no-reason-to-rush-to-upgrade.html