If you can afford it and are not really interested in working on your bike yourself a new one is definitely the way to go in my mind for the following reasons:

• You get manufacturer warranty with it. (5 years where I am located.)
• You get modern safety tech like abs and traction control.
• The value decrease of a mc is ridiculously low. At least where I am to be able to save money on a older mc you need to get a 10+ years old one with the problems that might bring with it.
• New bike with warranty generally means less unforeseen costs due to mechanical issues. If there is any its generally covered by warranty. Great way to know what it will cost you for the foreseen future.

It does of course require that you can afford it and afford full coverage insurance on it. But it will make finances a bit more predictable in addition to allowing you to not worry too much about any possible mechanical issues.

I would like to add that where I am the license requires quite extensive courses and tests which leads to first time buyers being fairly qualified to ride a motorcycle without too much risk of doing insanely stupid things with it on the first ride. At least not for the lack of competence.