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If you run a cron job that turns your feed items into emails[1], you can use your regular IMAP client on any platform. I prefer it over both web clients and native feed readers.
[1] There are a bunch of tools that can do this, but I'm going to give a totally unbiased recommendation for https://github.com/zsau/feedmail/
I used to do that, but you're tied to Thunderbird that way and I don't recall it having syncing for RSS, either. With a cron job, you're free to use whatever clients you want across multiple devices, with free sync thanks to IMAP.
If you already use an email client and have a place to run cron jobs, I highly recommend a feed->email converter. No need for a separate RSS reader, and you get cross-device syncing for free. Options include feed2email[1], feed2imap[2], and my own feedmail[3] (just "released", but I've been using it for years). I prefer clients like the latter two that can upload via IMAP, since that gives better control than sending via SMTP.
[1] https://github.com/agorf/feed2email