Rogue Cronus vs Rogue Cronus Magnum

There is no "better." They are both wonderful amplifiers, and your choice between the two should be based on the speakers you'll be using. For me, my speakers, and my room, the "plain" Cronus sounds sublime. My Revels are quite efficient, and there is a great synergy between my amp and my speakers. If your speakers are not too efficient and you need more power, then the Magnum version would be a better choice. Either way, the Cronus is a tremendous value and a terrific amp ! Have fun and Happy Listening.