This is what I've said in another thread about the decision:
Wanted Stella to win over Chris, but it had to be said based on tonight's show, Chris was better in every aspects. Shocking how bad Stella was in the boardroom.
The comedian presenter is really trying to undermine what Chris has achieved with the final task. to make Stella a worthy winner.
Loved Stella throughout the show but if getting the job is based on the final task, Chris should have won.
I got the sense Alan Sugar always wanted to hire Stella, she had it very easy in the interview process in comparison to the others and on the tour bus task she come up with the worst idea and got away with it.
I reckon Alan Sugar loved the idea of Stella growing up in a council estate and making something out of herself.