CVICU is good, but pretty diagnosis specific. If you want Swans and a good overall ICU experience, I'd go for Surgical ICU, you get plenty of septic folks, lots of drips, Swans, ECMO (if your facility does it), all diferent kinds of surgery patients, usually transplant, CVVH, basically a good overall smattering of patients.
And I had plenty of patients who were in for a post-op issue and had an MI so you get cardiac/EKG exposure as well.
Though Trauma has it merits, too. Trauma doesn't discriminate, I had a pt who was about four weeks post heart transplant and got biffed by a semi driving down the highway. Fascinating to take care of. I had plenty of Swans where I worked (but it was a Burn ICU as well as Level I trauma), loads of septic patients, lots of surgical issues, CVVH, and the bonus, I got ventrics/codmans.