I like Ancestry as it's pretty comprehensive plus more and more records are coming online all the time. Like anything and because there is such a lot there, it can take a while to get used to but you soon find your way around and learn lots of tips and tricks to get the best out of it.
One feature I like that is that you can easily find who else may be researching the same person and family and therefore gain access to shared documents, photos and stories that one might otherwise never see.
It looks like the current Ancestry membership offer rate for access to UK records is £95.99 so less than £2 a week. I have the World membership currently on offer for £139.99 so less than £3 a week so about the price of a cup of coffee. I use the site a lot, almost every day, to do research for others as well as myself so I regard it as good value.
If you are in no rush, look out for free access weekends to get a taster.
You can also get a lot of basic data from free sites such as FreeBMD and Family Search.