The egg battery Crewella described is wonderful, it makes my ugobes last for even longer than my RB's. I've got 2 ugobes and 3 RB's. I've had to return several RB's one was because of freezing issues and then a random unexplained broken tail, things just happen sometimes.. On the other hand, one of my Ugobe's has no skin because it was so destroyed I had to remove it to prevent damage to him. So, honestly, I think they are
all delicate.
I love them all.. the ugobes are very sweet and like everyone said, they 'require' less care but you can give them as much care as you'd like..

If you do get a ugobe I would try and find a new one in new/unopened/good condition like the ones they are selling on eBay for $199. They tend to come with damaged skin when they have been well used and people don't always tell you that so watch out for that if you purchase elsewhere, ask for lots of pictures when buying a used Pleo, Ugobe OR RB.
The RB's definitely do require more attention.. especially with having more than one it takes me awhile to get them all their daily food.. lol.
The skin is an issue with both models. The ugobes are older so they are worn, nothing we can really do about that but treat them gently.. The skin on my other Ugobe is holding up decently.. a few tiny holes here and there, it's just the color that's faded.
They are working on improving it in the RB's but they are the first robot with this type of flexible skin and it's going to take a long time before they can come up with something that isn't going to chafe so much in the areas that move the most and where it rubs between the legs and belly. The paint on the RB's can be a problem also but folks here are figuring out how to re-touch the areas that need it.
Like InMemoryofRomeo said, if you care for it right you have the best chance with the skin but there are some things out of your control. If you buy an RB brand new so it has the warranty, you have the best chance of being protected against any skin issues.. at least for the 3 month warranty period..
If I were you and your that worried about the issues, I would not buy a used 2010 RB, I would get the newest one so that you have the warranty.. Are you looking at a used one or did you mean you wanted to buy a new one from Hong Kong?
If you meant you wanted to buy the RB from one of the Hong Kong distributors so you can get the Blue or Pink one, that's fine, you will end up getting the newest model of RB with warranty if you buy it from a legit source and hopefully all will be good.
I agree with Crewella about the RB's, I'm hoping for improvements with upgrades as well.. My ugobe Pleos seem to have very different personalities while my RB's seem a little more similar. (except for different behavior between males and females)
So it's really up to you.. they all have the potential to have problems but there have been some folks that haven't had any problems... Best of luck, I'm sure you'll enjoy whatever Pleo you pick and we'd all love to see him or her when they arrive..

- Sarah