You absolutely cannot beat UTG for quality and price on many things. I have a number of UTG products, and I bought them after checking countless reviews and comparing different products and prices. Their rail hardware is top-notch, with quality on the same level as products that cost 4 or 5 times as much. Their stuff often is very slightly heavier, but for the price difference you can certainly live with it. I looked up the reviews on their AK collapsible stock for you, and everyone rates it highly.
I have no brand loyalty to UTG, but here are the UTG items I have wound up buying and using:
(1) AK lever-lock scope rail: I hunted with this on my converted Saiga .223. It survived a fall that broke the scope on it without a scratch. It allows the scope to be mounted a little farther forward than the "proper" BP-02 scope mount, which works out well because I cannot get proper eye relief with my new scope on the BP-02. Compared to a real BP-02, this mount is lighter weight but build quality is equivalent.
(2) Galil quad-rail assembly: This product was $70 and got stellar reviews, and is identical to another product that costs $400. I mounted this on my Galil. Very easy to install, very lightweight and good feel. No complaints.
(3) Weaver / Picatinny to sling swivel or bipod adapter: Price was $8. Cheapest competitor? $70. Profit margins on rail hardware are INSANE.
(4) Two very nice rifle cases, one of which is the ONLY soft case I could find that would fit my PSL with the scope installed. The other is for my Saiga. Price? $40 each. Build quality? Excellent.
(5) A 3-9x40 scope. Cost: $56. Simmons makes a lighter weight and overall more compact and better 3-9x40 at the same price. However, this scope had excellent optics and had no problems with the recoil on my Saiga .223. If I hadn't dropped the whole 10-pound rifle directly on the scope's eyebell during the aforementioned hunting trip, I'd probably still be using it today. Note: the glass did NOT shatter, but the tube bent. I replaced this scope with a Simmons, however. Both scopes were mounted on that same UTG mount.
Now, regarding Tapco and ATI:
Tapco has a few nice things, but their stocks are cheaply made and often ugly, as is most of their other external hardware. Only really good things they make are the Tapco G2 Trigger Group and the Saiga (not AK) Intrafuse handguard.
ATI is just butt-ugly, period, and their stuff should never be installed on ANY rifle. I don't even care about the quality. It's the sheer ugliness. ATI is primarily known for selling kits to poorly bubbify Mosin Nagants and absolutely horrible polymer SKS stocks. Basically, "How to turn your milsurp into something only a blind person could love."