depends, as stated above budget comes in to play, also how far you plan on shooting, longer distance = more power needed. One thing to consider is the objective lens size, you could also get super technical about it and go into field of view, eye relief, and all that. But at the end of the day its personal preference in my opinion, ive seen dudes with low power optics pinging steel at distance no problem. I ended up going with a 4.5x29 though