There really ins't a right or wrong choice here. More a matter of the type of injury you are using Arnica to find healing relief. Both products will contain some form of Arnica, based upon manufacturer.
Arnica Gel: I generally see Arnica Gel (usually aloe is used to form the gel) to be used more for injuries that will be exposed to the air (bruises, sore muscles, insect bites, etc.) Here you will want a product that absorbs completely leaving you grease free while providing healing and reduced pain and inflammation.
Arnica Ointment/Creams are in general used for deep seat chronic pain that you would want to wrap and apply moist heat to drive the Arnica deep into the tissues, to relief pain and muscle soreness.
Try Using a Herbal Arnica Pack
Apply Clinical Strength Arnica Gel directly to skin, cover with a clean soft cloth and plastic wrap. Place a moist heat source over the pack and let sit for 30 - 60 minute
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