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Emacs with various -TeX modes, mainly in Doom Emacs with the latex flag.

Emacs with auctex, cdlatex, pdf-view and always two frames. C-c C-a is super useful. Also pdf-view-auto-crop-mode.

cdlatex and in-buffer previews with (org-latex-preview) are great too when not writing in a .tex file.

This is how I originally got into using Emacs. As the best environment for LaTeX (via AUCTeX).

Standard emacs with Auctex for me.