Repair & Maintenance - The panels are hard wearing but as with anything they will deteriorate over time and as aresult will need replacing and, in the worst case, replacing. It will also be good practice to inform your house insurance company of them and ensure that they will also be covered.
Installation - there are many companies, and a quick search of the internet will show them, who are capable of installing the panels for you. But remember there will some time of disruption while the panels are fitted.
Asthetics - soalr panels are not overly offensive but be sure you are going to be happy with them in situ.
Wind power is obviously more suited towards those of us with more wind than the others! Often more rural places or those of us on higher ground will benefit more from the wind turbine. Before deciding on a wind turbine make sure you are going to get enough wind, unlike the solar panels (you are pretty much garenteed that the sun will rise tomorrow) you cannot be sure that it will be windy so these turbines will be useless on many days.