Although there are several sites that can provide you reliable and safe OSRS gold I would consider the best the one which I prefer for myself.
So, this is a pretty controversial talk when you say X site is better when it comes to buying gold. All i can say is thus far from all my experiences with Ariba is that it’s been pretty fast forward, they got some nice coupons and you can always get some free gold.
Ariba also has a 24/7 support service which makes it one of the best if not the best website to buy osrs gold off,you also get a purchase id on your account in case your light goes off or anything like that that makes buying gold not be a rush but yes a chill and calm process.
i could go on about how Ariba Gold is the best to buy osrs gold in a numerous way
no to slim chance of ban which gladly never happend to me , and a bunch of others.
all i can really say is buy wherever you feel more confortable with and gives you better perks , which in my case is in Ariba Gold.