I trade XAUUSD and GBPJPY the most and apart from them I hardly trade EURUSD because it’s a slow pair.
Here https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2063848 https://soar.suny.edu/bitstream/han...Keith_Final_Report.pdf?sequence=1&isAllowed=y https://lutpub.lut.fi/bitstream/handle/10024/166122/BSc_Thesis_Lähteenmäki_Johannes.pdf?sequence=1 https://arxiv.org/pdf/2305.14378.pdf https://cs229.stanford.edu/proj2019spr/report/26.pdf https://ceur-ws.org/Vol-3375/paper7.pdf
I trade only majors as I get 0 spreads on my Hotforex raw spread account, it is perfect for scalping.
I also trade mainly EURUSD. As an intraday trader, I like small spreads on it (my broker fxopen has a spread of 0.01-0.02), which is very profitable for me, when you can earn even on small price movements.