My 2 cents... If you're getting one 1911 then it should be chambered in 45. It should also be made in the USA (sorry, that's the purist in me).
The 1911 is a gun that, when made correctly, is an absolute joy to shoot and own. Cheap replicas can be hidden gems but they are few and far between. I won a Remington 1911R1 chambered in 45. It had a great price point but no bells and whistles. I gave it my TLC and it is an absolute nail driver.
The full size government model is heavier but that helps combat the felt recoil of the 45. There's more weight to counter it.
A 45 also opens up the opportunity to dive into reloading and competition shooting. Join a local gun club and start shooting on a team. Some indoor ranges require un-jacketed ammo and 45s can be reloaded with lead casts to combat that.
Some 1800 tournaments I am in require you shoot rimfire and centerfire so a 22 LR and under-powered 45 reload (and different recoil spring) will work great.
If you want a gun for real life, training, or concealed carry then I would strongly suggest a 9mm.
It's cheaper to train since the ammo is cheaper. You have less felt recoil and 9mm works better in compact / sub-compact firearms because smaller guns typically recoil more due to less mass.
Also, people who carry tend to think they won't miss if they have to actually use their gun for defense on the street or in the house. You can fit more rounds in 9mm than 40 or 45... This means you have more chances to hit your target during the stress / adrenaline / life or death situations.
Lastly, if your spouse needs to use one of your firearms in a life or death situation, it would be a lot easier for females to shoot a 9mm over a 45.
Ballistics in modern 9mm, 40 and 45 ammo is practically the same for all intents and purposes. So 9mm makes more sense in this day and age.