Trigger is all kinds of awesome.
Cross is...well, it's something.
Okay, I think Cross has a fair bit of merit. From what I've read, the reason Cross is so different from Trigger is because the guys behind it thought that Trigger turned out so well that pretty much any kind of direct sequel would be a disappointment, so they made Cross a very indirect sequel with vastly different mechanics, which is something I wish more game designers would do.
Also, it looks straight-up gorgeous even fifteen years down the line, and the soundtrack is absolutely stellar.
However....the plot devolves into a tangled clusterfuck that took me two playthroughs and a screenshot LP to figure out, there's 45 characters and enough meaningful characterization spread among them to make about eight good characters, and the gameplay sputters out after the disc swap.
Despite all that, I still think Cross is probably worth playing. It doesn't compare to Trigger, but it's not a terrible game.