Having been in the Studio cabins on both ships, I'd say I like them both. Although the lounge is smaller on Getaway, it has all the same amenities, including a bar.
On deck 8, the Waterfront (promenade deck), there is plenty of seating in the shade, including comfy padded sofas.
I usually with get the drink package or dining package. But I think this is a personal choice. If you do not drink much, if at all, the drink package isn't worth it. If you think you will be doing a lot of NCL excursions, they excursion credit may be worth it to you. If you're going to be online a lot (I personally like to disconnect and can usually find free WIFI in the ports), you get my drift.... I personally love the specialty restaurants, so I think they are worth it.