I have the strikefire II and really like it. I like the option of red or green dot and the build quality is great. I didn't like the look of the cantilever mount that came with it and I don't plan on using a magnifier so I'm going to get a standard mount for it.
I haven't had any experience with the Bushnell. I have the first Strikefire in black and a Opmod Strikefire ll. Both have been great and no problems with either. I used the the first Strikefire on my ar-15 and it performs well. It now resides on the 15-22 and the Opmod is on the ar. For a budget optic you can't go wrong with it. Also check out primary arms optics.
I just got this ' Monstrum Tactical 3-9x40 Rifle Scope with Illuminated Range Finder Reticle ' from amazon best I saw for the money at the time. Only one time out to sight it in a little at indoor 25 yards seems good an solid to me.