I went through this same exact decision about 2 years ago, I have researched both machines thoroughly. The Hamada was engineered after the Ryobi. Hamada has fixed all the flaws of Ryobi and thereby built a far superior press. The Ryobi has stuck with the same frame and all the crap they have been doing since day 1, and it is only because of being the first 2 color portrait on the market are they able to keep up the market share. If you are able to get a Hamada at the same price, go with the Hamada IMHO. The features on the Hamada work, such as blanket cleaners, etc., whereas the features on the Ryobi are a complete waste of money. Study the roller train of both machines and ask why they are different, compare the ink train to 40'' presses, I'd rather have a ink train that machines a 40'' than an AB dick 98. Also, research who is available to service the Hamada, because there aren’t a lot of them on the market you will want to know hourly rates and how far away the tech is coming from. Anyone can fix a Ryobi… everyone who has owned one needs to know.
I’ve worked on both machines, as an operator and owner I’d choose the Hamada any day of the week.