Caran D’ache Museum Aquarelle are the best but man they cost an arm and a leg.
Koh-I-Noor Mondeluza Aquarelle are woodless so good for larger washes.
Derwent Inktense are fantastic vibrant colors, but perform more like acryllic meaning they set once wetted and dried, which can be a fantastic feature when that is exactly what you need for layering.
I use Caran D’ache and Koh-I-Noor droppoint watercolor pencils because they are refillable.
