Bike and holidays

My job let me 26 days off every year. I used to split 2 and 2 weeks traveling doing bicycle touring in different countries.
In one of them I travel alone, me and my bike (or a renting local bike). Planning where to go, to sleep, etc. Doing everything by my own.
The other 2 weeks I usually hire a company. I prefer pay someone else (a guide)to take care about the trails, the transportations, the hotels booking, etc. In addition is a good chance to meet new people who like biking as well.
These are my questions.
[li]Do you prefer spend your holidays biking alone or with some agency specialize in biking tours?
[/li][li]How long do you like a biking tour? 2 weeks? 1 week? just a few days?.

Share your opinion mate.