SEGA has wrapped the SEGA AGES line, which brought numerous classic SEGA games to Switch with a host of improvements. The line was somewhat extensive, including numerous titles from SEGA's history. Which ones turned out to be the most popular? That all depends on what part of the world you're talking about.
In an interview with NintendoEverything, Rieko Kodama (producer/director), Yosuke Okunari (supervisor), and Tsuyoshi Matsuoka (M2 director) talked about some of the biggest hits in the brand. Over in Japan, Virtua Racing was the leader of the pack. As for the overseas market, Sonic the Hedgehog was the biggest hit, followed by OutRun. OutRun saw a lot of attention in Europe particularly. SEGA notes that the two Puyo Puyo games in the lineup also got a lot of attention, but that was in Japan only.