Here are a few differences:
1. Tea Partiers believe in bathing and other forms of personal hygiene; The vast majority of OWS's attendees clearly do not.
2. Tea Partiers boot out those who openly express racist, anti- Semitic, or otherwise extremist sentiments (Who almost always turn out to be liberal infiltrators); OWS's attendees do no such thing for the open racists, anti- Semites, and other such extremists that attend.
3. Tea Partiers are law- abiding citizens who obey the law, treat the police with respect, and remain peaceful; OWS's attendees are a bunch of lawless thugs who refer to the police as "Pigs" to their faces, have zero respect for the law, and have no problem whatsoever resorting to violence and crime in their efforts.
4. Tea Partiers arrange their demonstrations in such a way as to not be an inconvenience to other passing citizens who are not involved (i.e. at one Tea Party I went to, the demonstrators numbered in the thousands, yet they all lined up along the sides of the road, in such as way as to neither block the normal flow of traffic on the road, nor hinder pedestrians on the sidewalks); In contrast, OWS's attendees deliberately go out of their way to inconvenience, agitate, and generally piss off passing citizens who are not involved, through such tactics as blocking public roads.
5. Due to Tea Partiers' belief in personal responsibility, they pick up after themselves, and after it's over, the Tea Partiers leave the demonstration area as clean as they found it, if not more so; In contrast, the OWS attendees (Many of whom self- righteously claim to be devoted environmentalists) do NOT pick up after themselves at all, preferring instead to leave their garbage strewn around everywhere (Keeping in mind that they love demonstrating in public areas such as parks), and after it's done, they leave any areas they congregated at looking like a garbage dump and smelling like a public toilet.
6. Tea Party events individually last a few hours each, because their attendees generally have jobs, families, or other such responsibilities that they cannot shirk for the sake of a political movement; In contrast, OWS's attendees are able to camp out in the areas they occupied for weeks on end, because they tend to be unemployed and have no such responsibilities to worry about, or if they do (i.e. college classes), they have no problem ditching them in favor of doing more protesting.
I may post again if I think of more.