Depends on what you are looking for? You are not going to see any performance improvement on a stock engine with any injector, since the ECU will just pull fuel to where it wants.
As far as quality, you can't beat OEM. They last 200k+ plus. I have not used a bostech before. I did use aftermarket ones on my 3rd gen Pickup that had an antiquated spray pattern that helped, but there's not much to gain on the more modern 3rd Gen 4Runner engines.