I would never dream of treating my children differently.
This is so true, Op, I don't even understand why you are even asking the question.
I am the 'Andrew' in your scenario, in that I went to a good uni, got a professional degree, married someone within same field, both worked hard and were mortgage free in our 30s, despite not earning anywhere near what your DS earns.
DB on the other hand, despite going to a grammar, left it at 16, did a couple of years work, then gave up and has, as he openly admits, "lived off the state" ever since, 40 years. Married to someone who works but is from a culture where her money gets sent home.
Unbeknown to me, my mum was bankrolling him for years, and eventually gave him and SIL a large lump sum to buy their rented house with. Not a word to me, until I inadvertently found out a year before she died. Glad I did, as she had kept the payment receipt, it would have been a massive shock to find out when sorting her estate, when he would have gloated that he was the favourite etc. It wasn't about the money.....we don't have expensive tastes and have enough to live a comfortable life....it just felt like she had made a massive statement about where I stood in her affection, and it certainly wasn't equal to DB. Not to mention humiliating me by telling other relatives but swearing them to secrecy.
I fully expected him to pull out a new will when we sat with the solicitor the day after her funeral but she had had the sense to keep her original will (despite pressure from him it seems).
Whilst I know it was her money, to do with as she pleased, it still hurts and I still wonder if she just loved him more than me.
I have DS at uni, bright but also very organised, prepares thoroughly for interviews etc. I know he will go far.
DD is still at college, not as academic, so even if she does get to uni, I suspect she wont earn as much as him (but who knows).
I would never, ever, ever consider not treating them equally and I have told them that. They both saw how hurt I was by my mums actions, and also lost a lot of respect for her too, which was a pity, they were both close to her, used to spend time alone with her in school hols when younger.