Lykke interchangeable circular needles are my favourite! I have a set of the bamboo ones but the standard wood they use is also very nice! They glide very well and I love the wide colour variety. For crochet I love my tulip red hoos. They are like butter, the yarn just slides!
Chiaogoo interchangeables. Theyre the only interchangeables I have and Im very happy with them. Their bamboo tips are also nice but you have to buy them separately.