LA offers both a brown tan, which is there standard range available in 10-20% and a 'gold' range that is a golden tan. I love the brown tan but have heard mixed reviews about the gold range.
Sienna X is a golden tan, quite similar to Nouvatan if you have tried that before. Personally I prefer Nouvatan for various reasons.
Personally I stock both LA (Brown) & Nouvatan so I can offer both types of colour. Golden tans are more natural looking but can look orange imo if not applied correctly. Brown tans are deeper & darker tans and more popular with hard core tanners x