Just like several others, I too use an alcohol stove - for southern winter hiking. Winter hiking in the North (Maine, NH, VT) an alcohol stove is a bad idea. It also depending on the design of your stove of course - different alcohol stoves boil water faster than others.
If you go with white gas, I strongly suggest testing your stove out several times first prior to going. I don't know how many times I've seen a "fire ball" of flames go up from hikers not knowing how to properly use their stove. The suction cup - inside the pump may require a little care prior to leaving - they tend to dry out fairly quickly.
Which one is better alcohol or white gas? Well that really depends on you. If your only cooking 1 meal a day and not using your stove for hot drinks around camp - spend more time hiking than camping then alcohol might be the better choice because of its lighter weight. If you are planning on spending more time camping, like having hot drinks along with your dinner than gas might be a better choice.
Wolf