I have both CU24 and 594s. I play them through a PRS HXDA (a Plexi style amp), a PRS DG30 (kinda Vintage Tweed), and a Mesa Lone Star 100.
The guitars certainly work well with all the amps.
Obviously I know nothing about what you like, and it’s none of my business why you sold your Lester, but...that may be a clue about which of the two PRSes you’re looking at might work better for you.
Essentially the CU24 is a more “contemporary” guitar in terms of tone and pickup hotness, though PRS’ Tremonti is made for heavier styles, as someone pointed out, and PRS has made some others for metal players. Also, the CU24 Floyd is a separate model that might appeal more to a metal player.
The 594 is a very vintage sounding guitar, with PAF style lower output pickups. It leans in the LP direction, which is why I asked why you sold your LP.
Of course, none of these descriptions really matter, because you can make any style of music with all of them, I.e., if you play rock/metal well, they will all work well for rock/metal but each will sound a bit different, of course. Also I can’t imagine anything more subjective than what constitutes a great clean tone. Everyone’s different in how they define that.
So here’s the best advice I can give: Even if you have to get in your car and take a day trip, it makes the most sense to play a few models before dropping the coin on one. Advice from a bunch of internet strangers, who know nothing about your tastes and abilities, is going to be worth exactly zero.