We chose a windows based tablet for our sites rather than ipad, since our property management system is windows based. Our tablets were what our data provider (Verizon) recommended at the time, and which they support, so while they may not have been the best of show, we had one point of contact, the service became part of our phone and data agreement, and seemed like an OK deal at the time.
That said, I have really been surprised (OK, disappointed) at how much our team uses (or doesn't use) them. We give training, ongoing tips for using them, try to sell a "coolness" factor; When we do our weekly webinar training, if there is ANY way the tablet fits it we show how it relates to that week's training. It is really easy to use ResMan, our PM system, on the tablet too. We surveyed our teams on what they use it for, what would make them use it more, etc., and the bottom line seemed to be that those who will use the tablet will, and those who won't, well, I encourage them to keep it dusted.
Even if they aren't using it now, we don't take it away or appropriate it to another site, hoping something will inspire them that this will make their lives easier!
Be sure and test whatever type you decide on with your PM System, and some team members (the most and least tech-savvy!) And maybe poll your whole team on whether and how they will use them...