We are the Edugeek Thin client forum sponsor and we make thin-clients that have the benefit of NO operating system, so get most of the benefits of both the models you mentioned without the drawbacks. (Complex unfamiliar Linux scripts and cost of XP). We take the view you buy a thin client to run RDP or ICA, not an operating system, so we have optimised our hardware for this purpose - and run RDP/ICA direct from hardware.
You will find many positive posts on Axel products in this forum.
Let us know if we can send you an eval, the only 'obiligation' is that you agree to send it back if it does not suite your purposes. The device is only the size of a cigarette packet so the return postage is not much! Matthew@axel.com
0845 225 2822