I have visited both the Czech Republic and Slovakia. As per my expereince, People in Slovakia are much nicer than those in the Czech Republic. To a lesser extent, I didn't meet someone who tried to rip me off. I'd say I like Slovakia.
If you'd like to receive additonal responses, I recommend posting your theme at http://www.backpackers.com.tw/forum/
There are many nice, experienced backpackers who would be more than happy to give you more veracious advice.