The apparel giants battle it out as both trade near their 52-week lows.When it comes to sports apparel, Nike (NKE -1.74%) has long been the top dog. However, challengers are coming for the top spot, including athletic leisure and apparel company Lululemon (LULU -1.85%).Both stocks have been very lucrative to own over the long term. Unfortunately, they're both in a bit of a rut, trading within shouting distance of their 52-week lows.I think these dips are great buying opportunities for long-term investors. B ...