I used WPML as well in the past (even have a full license) but TranslatePress is much faster to setup. Like 10 times faster. Much handier with automatic translations. Also the loading time seems to be better.
WPML is a bit like 2014, TranslatePress is 2020.
TranslatePress has some negative points as well, but it clearly wins.
Every sitemap plugin generates their sitemap in a particular way, thus we need to add individual support for each sitemap plugin. It’s a requested feature, and we count it, but we don’t have a timeframe for it.
You can use Rank Math plugin for sure, but our SEO Pack Add-on adds support for Yoast SEO Sitemaps so they correctly represent each individual translation.