I have no knowledge of Rock Island Arms, so I lack basis for an opinion.
Truth transcends time: we get what we pay for with the caveat that higher price does not always translate to better quality. Some iterations of the 1911-A1 are many thousand of dollars more expensive than the Springfield Armory TRP. Based upon my TRP experience, I feel safe in writing that the thousands of dollars premiums for other brands' 1911-A1 iterations do not translate to superior quality. It's probably true that the TRP is superior to other brands' 1911-A1s costing more than twice the price of a TRP.
If a handgun's intent is to save its owner's life, he should consider buying the best quality he can afford.
I've owned a couple other American made brands of 1911-A1s. I never completely trusted either.
About five years ago, I bought a Springfield Armory Loaded Model. It's intended use was between trout bites, relatively inexpensive entertainment for my kids. It's value greatly exceeds the price I paid. I did get an excellent deal on it. That gun has been absolutely flawless. It's far more accurate than were my other 1911-A1 brands. I was and remain so darn impressed with my Loaded Model that I sold my other 1911-A1 brands and bought an EMP 3 9MM for concealed carry, a TRP .45 ACP for wilderness self-defense, and a Professional Model .45 Auto that I've yet to fire. I would be completely secure carrying my Loaded Model for wilderness survival. Due to harsh Rocky Mountain conditions, I wanted ArmoryKote that's standard on the TRP. Anyway, all of my 1911-A1s are Springfield Armory.
Competition is beneficial for consumers. However, options must be carefully assessed to determine whether they are authentically competition. Since I lack knowledge of Rock Island Arms, I cannot definitively write that RIA is a legitimate competitor of Springfield Armory. I will add that if RIA does not use forged slides and frames, I could safely conclude that it's not SA's competition.
I'll almost exclusively buy American products if I can.
Based upon my experience, it's always right and never wrong to go with Springfield Armory's line of 1911-A1s.