>>77353190I know this is catalog bait but I'll try a semi-serious response.
Some holos, especially the singers, had a certain vibe to their orisongs. Like Towa had "cinematic" rock while Shion follows new gen vocaloid artists. Most of Suisei's songs are high-concept jazzy/electronic pieces that would appeal to music critics and fans, but it's not catchy enough for me, maybe because they're overproduced.
Most Holo songs I like are simpler, they let their inherently catchy melody be the main draw. For example:
>Riribi by Roboco>Lunch With Me by Nene>Our and Your Song by Miko>Now On Step by WatameMy favorite Suisei song of all time is Ghost for this reason, but none of her newer songs had the charm Ghost had.