All my waxing ladies out there 🙋🏻‍♀️ advice needed!!

Good afternoon to all of you lovely ladies!

The 6th of May is mine and my husbands first wedding anniversary. I am having my sister in law wax my legs for me (she’s a cosmologist) she has thinner blonde hair so idk if she really has much insight about which type and brand of wax I should use for my legs. My hair is almost black and extremely thick and corse! I need suggestions. Anyone have a go to brand that has the same Amazonian woman leg hair issue I have? Lol