Like Cathie said, you have to compare numbers, pros and cons for each program. Think about what kind of nursing job you'd like to have in the future, and see where that leaves you, too. In many places, LPN/LVNs are limited to nursing homes and medical offices; many acute care facilities and hospitals require RN licensure now. Then again, that too varies by geographic area. Look at the kind of job you'd like to have, and see if the vocational school license will get you there. Then decide if that's where you want to stay.
If you decide to move to an RN later, realize that the credits earned at a vocational school rarely if ever transfer. There are programs that consider your LVN as a way of skipping the fundamentals course (usually by testing out) but not always. There are bridge programs of LVN to RN, but you need to know that this is an option for you, too, based on schools in your area.
Alot to consider