Use the one method that works best for you, period. I don't understand why people forget that they've been doing the same with TinyMCE for YEARS...I mean, every single WP user that I know of has a mishmash of writing style/techniques (plain text, format with TinyMCE tools, Markdown etc) , shortcodes, HTML, plugins and whatnot that works for them...and most of the time that "recipe" wasn't found easily, it took days, weeks, months, even years to get it right. Gutenberg isn't any different.