I tend to go with whatever is on offer, and usually one or other of the main brands is doing a promotion - whether it's powder, liquids, sachets or whatever, I've used them all.
So I recently bought a gigantic box of powder Surf 'with fragrance release - Tropical Lily and Ylang Ylang' - just read that off the box! 
I can honestly say it's the nicest product I have ever used. The smell of the washing is gorgeous and sticks around. I have a Wincheater jacket that I only put on to go for my daily walk and every time I pull it over my head, I get the glorious smell and I washed it three weeks ago. Even the kids have remarked on how lovely their clothes smell and it cleans well too. Just done all my white bedding and it's out of the line now blowing in the breeze.
My mum (who was a washing fanatic in that her white sheets and crisp laundry were her pride and joy - she even ironed underwear) swore by Ariel. She wouldn't use anything else.