It's very difficult to get a job in the cath lab, at least in my location. Everyone wants their schedule! Ours requires 1+ years of ICU experience, or 2+ years of med/surg. In my opinion, it's very specialized and you won't get the chance to expand your skills, critical thinking, time management as an independent student.
Since you likely won't be working here has a new grad, you'll lose valuable opportunities to practice these things. I would do something more generalized, like ICU or med/surg if cath lab is your end goal.
Again, this is my location. It may be different in other regions.