I always suggest Roots Magic which is a very reasonable price, in it you can create a project and download all your Ancestry tree including the Media linked to it, this feature is vastly superior to using a Gedcom.
The real beauty of Roots Magic is the Tools, you can correct the errors, remove duplicates, test for floating trees etc. Once done the Database checking tools can then be run and once that is done Tree Share back to Ancestry and your Ancestry tree is as error free as you can make it.
Then you can create an Ancestry Gedcom as a backup, and as one you can use in other software.
Then you can decide on the long term software that works best for you.
Simple and uncluttered Family Tree Software it is not!
As well as Roots Magic I have Family Tree Maker, Family Historian, Legacy (Mac only) and MacFamily (Mac only). Each has their Pros & Cons but Roots Magic has the best Tools, I simply do not like Family Historian, Legacy has the best chart making options, MacFamily is quirky.
That leaves Family Tree Maker with which you can also download and sync an Ancestry Family Tree. I find it very user friendly and it is my choice for when I cease having an Ancestry subscription.