I've been using Lookiero, but thought I'd give StitchFix a go, too. It was pretty good for a first box and based on the info I'd given about myself. There were a couple of things I really liked, one a top which I already had loads similar too and the other a snake print midi-skirt with 2 splits. I'd probably never have tried it on in a shop or if I'd seen it online, but I loved it and ended up keeping it. Its fab! With SF and Lookiero, the £10 monthly fee seems to be credited against any purchases, which I think is good.
I like that a lot of the things I've been sent, especially Lookiero, is from European brands that I've never been aware of.
I guess I joined both schemes to try and get just a little outside the normal stuff I keep buying over and over. Its ideal for me. With Lookiero, you can give them access to your Pinterest style board, if you have one, to give your stylist ideas on what you like and what you'd like to try. You can ask for a trend led box or fir your items to be more timeless and you can set price limits.
With both boxes, you can leave comments on what did and didn't work, what colours etc you'd like to try and you can ask to change stylist, too. I think it's been better for me to stick with one stylist, so we can learn together. Returns go in a postage paid bag, mine have all been via Hermes so I have taken the bags to the local pick up point at the Co-Op.
The only downside I can think of with StitchFix is the limited time you have to decide and send back anything you don't want. It's not ideal at all and I believe I'm not the only one to have fed that back. Fingers crossed they change that as it could be a reason to just stick with Lookiero instead.
I don't think you've anything to lose giving it a go. Lookiero do your first box without the stylist charge. Not sure about StitchFix.