I'm following the Slimming World plan and recently decided to buy myself a Fitbit. I went to PC World to buy one yesterday and then came across the Jawbone UP2 on offer. I left empty handed because I just couldn't decide. The fitbit I was going to by myself was the zip and it looks really good. I understand the Jawbone measures more like sleep and you can log food too.
I can't decide between the two. I know they both connect to an app and I like the idea of this.

Any suggestions would be appreciated. Thank you

I've got the Fitbit Flex. I can track food eaten, water intake, calories burned, calories eaten, steps taken, how much sleep I have (or don't have in my case lol) and can also do challenges against any friends and family that have a fitbit. You can log exercise too and it has a general idea of how many calories you've burned doing said exercise.
It sits in a bracelet and you wear it just like a watch. I forget I'm wearing it most of the time! I got mine on offer from Amazon in Dec 2014 for £40 (I think!)

I did look at others, but settled on the Flex in the end, no particular reason why, I just liked it lol

I have got the Fitbit flex too and I love it. I can see all the steps I do, take part in step challenges, it logs sleep and you can link it to my fitness pal app. I'm definitely glad I chose this one as it's very motivating

Fitbit it is! I'm just gonna take the plunge and do it this time lol! I'm so indecisive it's ridiculous! Thank you ladies! Xx

Not sure if you got a Fitbit but the Xiaomi MI Band 1S is a pretty decent low cost alternative that has much better battery life (10 days ) and is a lot more water resistant. Does heart rate, sleep, calories etc. Only issue is motion sensor is a bit more sensitive and if you gesticulate a lot when talking it can ramp up your step count. Still for £25 is not bad.