These 2 are a good buy for the money, when the IR came out over 10 years ago it was almost twice the price. Not the best but it works good an will last, you can get parts easy for it.
The Astro is no powerhouse, its almost 10Lb less torque than the IR, CP or Florida but for 1/4" its 16Lb is okay, Astro isn't top shelf but their stuff is dependable and works well.
I don't usually recommend HF stuff and I cant recommend their 3/8 either because I don't own it buy guys claim its decent. It does have one nice feature, its reaction less meaning it doesn't want to slam your fingers into the closest metal object every time it tightens a bolt.
This feature is found on high end tools and it works great, HF calls it an impact ratchet which it really isn't, my biggest concern with HF is the lack of parts support. Still, at that price point it might be worth looking at for that feature alone, it isn't the same quality as the IR though, buy it knowing that and it may end up in the bin sooner than later right up front.
https://www.amazon.com/Ingersoll-Rand-10...ive+air+ratchet
https://www.amazon.com/Astro-Pneumatic-AST1111-Mini-Ratchet/dp/B000LQLGG0/ref=sr_1_11?ie=UTF8&qid=1471781088&sr=8-11&keywords=1%2F4+drive+air+ratch
