Random, tired tidbits-
LVH is the most comprehensive, if you want a particular specialty look there. If I was a med-surg nurse I might look at Lukes or Sacred Heart first. For OB probably St Lukes, thats more philosophical LVH has a very high epi rate, Lukes will work with midwives. (but NICU- LVH hands down) OR- Lukes uses a lot of scrub techs (has their own program), very rarely RNs in that role. LVH is specialty specific.
LVH orientation is long, and they have a thorough program for all new grads- many sessions seperate from older RNs, some together. Not sure about the others. Pay is highest at SH, lowest at LVH. LVH may have the best insurance, though, not sure. If you're a per-diem or PT worker you'll notice the difference. Both LVH and Lukes use nsg staff- RNs and PCTs for labs, etc. They have PCTs doing a lot, some things you may or may not be comfortable with. SHH has phlebotomists, aides are in more limited in role. Not sure if Lukes still has that IV team.
I don't see much difference in care of workers/ respect for nurses. LVH is Magnet so they seem to focus their good points around their guidelines, but they fall short in other areas that other hospitals meet. Several years ago, they were the least staff, esp RN friendly place- they've gotten much better. Expect some mandated OT there. SHH is generally behind in shiny up to date equipment but do/have somethings that at LVH are done in older, less efficient ways.
Parking is free at Lukes and Lehigh but expect to hike or shuttle. SHH uses a pay garage with an employee discount but is safer and less time consuming/ frustrating.
Try contacting about shadowing. If they really want you (and have nothing to hide) they should accomodate! (I have that "you're the one that needs me, meet my needs" philosophy about job hunting, though) Keep an eye out though for the free perks like recruiting dinners, though! In the long run, you're paying for it, might as well go!