I’ve had both, and traded off the Springfield.
My R1 has been 100% reliable, shoots to the sights (nice big sights), and is accurate. I replaced the flat mainspring housing with an arched one, but other than that it is stock.
My son bought one for himself when he turned 21, and his experience is similar to mine.
I don’t know if the frame is cast and I don’t care. I do appreciate it being made in the US, even if it is New York.
I also own a Colt LW Commander and a Sig Tac Ops 1911. They fill different niches, but I can’t really say they are better than the Remington.