I live in south Warrington (Appleton), so just along the motorway from Lymm.
We sold our house in 2011 and were house hunting in the areas of Knutsford, Lymm, Altrincham, Wilmslow and Bramhall.
In the end we decided to remain here in Appleton for a variety of reasons. My first preference would have been Knutsford but the high school isn't well regarded. Second would be Altrincham for the access to grammar system but TBH our budget at the time was about £550-600k and that doesn't buy much in Altrincham - I figured that the kids are in school for a short period but I have to live with the house forever.
We discounted Bramhall as the commute to my job was a bit rubbish and Wilmslow because we just didn't like the feel of the place.
I know Lymm quite well but I've never liked it. I've always had the sense that people living there think they are better than everyone else but actually there's not much to Lymm in terms of shopping/eating and I don't really understand why the hype. I'm sure a whole army of people from Lymm will now come along and disagree but that's my opinion.
However, on the plus side, it's within catchment for the grammars I think. The high school is well regarded but for the last couple of years, our local high at Bridgewater has done better in the GCSE league tables (it's now 81 or 82% A-C).
We stayed in Appleton because we are happy with the primary school, it has a real sense of community. We are happy with the motorway links, the countryside on our doorstep, halfway between Manchester and Chester, with the house prices (just!) and the high school. We are five minutes drive (20 minutes walk) from Stockton Heath which has lots of restaurants and a few nice shops and we can walk to country pubs.
DH worked in Stockport, it was an easy commute but he left at 7.30.
What's your budget?