secure is Installation of ubuntu or should be dual with windows?

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http://askubuntu.com – I have used ubuntu for almost 6 months full time at home while using windows for almost 6 years,so I previously used ubuntu on separate hard drive while I have one attached hard drive with partitions having NTFS file system so I used data from those partitions also. Now I want to again shift to ubuntu as I am a web developer and want to use ubuntu and I have a hp probook. So I just want to know few things: Should I use wubi? But I have heard it is on windows installtion mercy still that is not good. Should I use dual boot and configure it separately without any wubi e.t.c.? Or should I insta (HowTos)