This all depends what kind of statistics you are looking for (Defense, attack, agility, etc). When catching these two Pokemon their base stats are similar but they do have differences. Magmar is higher in attack over Ninetales, but Ninetales has higher defense and stamina stats.
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I prefer arcanine. It mainly just depends on your style. A level 50 arcanine is scarily powerful if trained correctly. He has a point. Arcanine is wicked strong. I would also maybe suggest Ninetales or Typhlosion.
Rapidash. Because Rapidash has a higher stats than Magmar. Rapidash also has more powerful attacks than Magmar.
No, Ninetales cannot evolve.
Here are some of the ones you can get without trading/migrating: Cyndaquil, Quilava, Typhlosion Flareon Vulpix, Ninetales Growlithe, Arcanine Magby, Magmar Ponyta, Rapidash Legendaries: Moltres, Entei, Ho-oh
you can't breed vulpix unless its a ninetales, use two ninetales or ninetales and a ditto to breed.