regarding the strength, it probably depends on the manufacturer of the aftermarket parts.
I used aftermarket on the front of my Tacoma and was happy with the results. Saved quite a few bucks. If possible, I would compare the aftermarket side by side with the OEM. If they look similar, that is a good sign (I'm not necessarily saying, however, that they would necessarily be the same strength in this case). If the aftermarket looks chintzy compared to the OEM, maybe consider passing on that part.
In my experience sometimes cheap metal parts "look" cheap.
2006 LS. Automatic. 4 Door. 31k miles.