I've tried both, in fact. I had rTMS done for a few months, and a couple of different protocols of ketamine infusions. rTMS was mostly just killing time after

I've tried both, in fact. I had rTMS done for a few months, and a couple of different protocols of ketamine infusions. rTMS was mostly just killing time after I got used to the noise and sensation - the doctor I saw had a TV mounted with Netflix and other services available for you while you sat there. Ketamine (IV; I haven't tried the esketamine nasal spray that got approved) is an intense experience each time - many doctors advise people sit in dark rooms with headphones playing music while the treatment goes on. I usually describe it as removing a lot of the ability to ignore things - that is, you experience a cognitive burden for all the things you're seeing/hearing/etc in the room, and sufficiently much cognitive burden is draining. It also affects your flow of thought a lot so you don't necessarily track well in conversations with people until you're more experienced. (I also found that it made my emotions very directly influencible by the music or conversation or w/e was going on during the treatment.) It often makes people nauseous or vomit, so every clinic I've been to stocks an anti-emetic and a bucket. Some doctors also give you a benzo with the ketamine because it makes it a less intense experience. There's inconclusive research on whether this dulls the antidepressant effect last I looked - I requested during my most recent treatments (mid-late 2018) that they not use it, and they were happy to comply, but it definitely makes the experience less visceral. rTMS I saw no personal benefit from even after extending the treatment interval past the usual number of weeks. Ketamine I saw massive improvement a month or so after doing an initial treatment of 6 infusions in 2 weeks, but after a few weeks the effect lapsed (though I'd been having "maintenance treatments" periodically), with no recurrence regardless of the protocol we tried. Please feel free to ask if there's some specific questions that'd be useful to have answered.