Best way to use limited Laurels
The ascended amulet, that’s for sure. They are the cheapest (30 Laurel), and provide the most stat boost. You will want either the zerker or celestial (all stat) as they give you the best crit dam% per stat trade off.
If you play some WvW you will most likely have some batches aswell. If you do not use them for anything else I would recommend buying your Ascended trinkets in WvW at the Laurel Vendors. You can save 10 Laurel per Item but have to use 250 Badges instead. Depending on how frequent you play I would rather recommend this than earning another 10 Laurels per Ascended item.
If you plan on playing some Fractals I would also recommend to not buy any Rings. The Ascended rings appear to have quite a frequent drop rate in Reward Chests. So focus on the Amulet and maybe on Acessory.