I have handled both. It I had to choose between them I’d have to say the Tisas, but it’s a slight favoring. They are both built pretty well. They both shoot well, they are both built pretty well. However, I’ve handled new displays and I’ve found a couple RIAs where the fit and finish was just slightly off, requiring some adjustments. As an example one had a little too much parkerized finish on the rails making it hard to rack. Another had a similar issue which made the slide not return to battery cleanly. Both, I would think, would work themselves out by shooting them.
The Tisas I’ve handled at stores didn’t seem to have that issue. Now, I’m not saying RIA is bad, and they shoot almost identically. Just observations that lean me towards Tisas slightly over the RIA. If the RIA was the only one available, I wouldn’t have a problem buying it.
I personally chose the Tisas, because I got it cheap.
$389
Not a 1911
But it’s $389! 
Who shoots 1911 these days? 
Let’s find out which one is better: Tisas PX9, or RIA 5.0 
That’s an interesting comparison as they’re completely different, outside of being striker fired pistols. Also, the 5.0 is an all metal competition pistol for like 1000 more so… I guess yeah, why not compare 
Edit. Sorry I forgot the 5.0 is an internal or non exposed hammer.c
Thank you for the information, but it’s unaffordable right now. 
@Karacal always wants us to spend more money than we should…
To my way of thinking, you are on the right track (dollar for dollar) with RIA. I might also suggest Springfield Armory, which I believe is a step up from RIA. My 1911 is a Springfield Armory RO (Range Officer) - a full size 1911 clone. When I was considering the purchase of some .45 ACP +P ammo for it, I first called the SA factory and asked if it could handle the pressures. The tech I spoke with replied, “Pffft! Hell yeah! The dang thing is built like a tank! I wouldn’t use +P all the time but occasional use won’t cause a problem.”
BTW, 10 round magazines are available for 1911’s, too. I had mine fitted with a Wilson Combat compensator, which necessitated having a Kimber guide rod installed. It eliminated the muzzle barrel bushing and required the making of a special tool for take-down, but shoots standard .45 ACP 230 grain ammo like a 9 mm!