I use both. Ko-fi offers 0% fees for handing tips, which is fantastic, and they have (free) features that you can use to incentivize interaction, like Leaderboards, messages left, goal tracker, etc. If your users adopt platform use regularly, you can consider going for their paid services which include basically replacing Patreon as an alt subscription platform like Patreon.
Patreon has been on the scene longer, so has better brand recognition, which has value to potential users. I only use about 5% in fees, but I hear they charge more now for newer creators, I cannot confirm. They are better imo for hosting content or showcasing content to audiences than Ko-fi.
As for advice, I suggest using both. Kofi is your tip jar. Gamify interactions as able. Patreon is your alt sub platform, gives users choice in supporting you in the way they choose, based on their confidence in another recognizable brand.
If looking for any more specific advice, just ask :)