There has been quite a bit of debate [1] about who was first with a working electronic von Neumann (in the widest sense of the word) design, the modified ENIAC or Manchester Baby. I have to say that I'm a bit torn and can see both sides on this.
I would say though that the Manchester machine, architecturally and in other ways, looks and feels to me much more like a modern computer than ENIAC.
"Seventy five years ago, the University’s ‘Baby’ computer became the first electronic computer with a read/write memory to run a program." says the article.
The modified ENIAC used a kind of ROM for its program (a function table), so the addition "first....with a read/write memory" deals with that.
I would say though that the Manchester machine, architecturally and in other ways, looks and feels to me much more like a modern computer than ENIAC.
[1] https://computerhistory.org/blog/programming-the-eniac-an-ex...