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Ah yes of course it is, root position is fine, but II6/5 works much better because the bass line leads up to the dominant note chromatically. Also in general, ii6/5 - V7 -I is much more common than just ii7 - V7 - I, first inversion sounds better, and the seventh adds strength to that relationship. One reason I can think of for this is that it makes the V - I relationship clearer. II7 - V could be misconstrued by the ear as a perfect cadence, but II6/5 - V just sounds like it's leading up to a perfect cadence. Of course if you want to use II (with a major third) at other points in your piece that's fine, and it doesn't necessarily need to lead to perfect cadence. You could also use it to get I6/4 for example.
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