IMHO, either one has advantages and you should consider them in relation to being a nurse.
It really helped me to be an assistant on a unit while I was in school because I saw daily what nurses really do, and although I myself did not get the hands on experience like in clinicals, I was less nervous about asking the RN's I worked with questions, and I got to watch them do things you don't always see in school. They knew I was a student, so would go out of their way to get me for a procedure, explain what they were doing, etc. Really helpful for "Real World" nursing.
On the other hand, I now work on a tele unit, and the experience of being a monitor would have been invaluable to me. BUT, as an RN on a tele unit, I use my monitors as a great resource for what I don't understand. I call them often with questions about a funky rhythm, etc. They all know me by name, and they are really great at answering my questions, so I don't feel like it was really necessary for me to have that experience prior to being a nurse.
Hope this helps.