One of my main use cases for my large iPad Pro is reading PDFs of tech articles with lots of math, code, and figures. That said, I bought a Lenovo Duet Chromebook tablet with keyboard and pen included (for 10% of the total iPad Pro package) and the slightly smaller Chromebook does almost as well for reading tech papers (and has useable Linux containers).

Shop around. You should be able to load up a test PDF from the web on demo units at stores like Best Buy, etc.