Palm Treo 700w / 700wx

Hi I just have a few of questions about these 2 pocket pcs. First what is the difference between windows 2003 and 2005? Second are the screens the same or is one a better quality? It also seems that the i730 has more program memory is that true? I'm liking the treo better because everything seems a little more easy to do and possibly with one hand and has a camera. One more question! Since I noticed the treo only has about 14 megabytes of memory for programs is it possible to run programs from a memory card? Any help or advice would be greatly appreciated