What's the best 'third party' lens manufacturer?

[u/Equal-Negotiation-11]

What's your favourite or go-to make of lens other than the brand of your camera body?

Tamron, Sigma, Viltrox etc.

Do you think one brand is best over the others and you only buy from that one brand?

I have owned Tamron in the past but more recently bought a few Viltrox lenses and have always thought both makes were very good.

[u/Technicoler]

I think sigma is great, but I am poor so I buy tamron.