At least Thatcher knew what she wanted and what she believed in. You knew what you were getting, even if you loathed it - I wouldn't trust either of these two.
The last two Tory leaders didn't come top of the MP's ballot, so May is not a shoe in for this yet.
The electorate in general have done some very strange things recently, and an electorate made up exclusively of rabid Tories could elect absolutely anything or anyone.