If we consider Kale and Broly's versions of the form to have comparable boosts, then LSSJ >> SS2 given her fight with Galu. If we view them as separate cases though given how the SSJ multipliers in Super seem to be a lot different than in Z, it could go either way from LSSJ being superior or equal to SS2. Koyama's statement about Broly being the strongest Saiyan would imply M10 LSSJ Broly > SS2 Goku, but the same could be gained with the form being equal to SS2 when considering the Daiz states M10 SSJ Broly > Boo Arc SSJ Galu.
Regardless, I'd still say LSSJ > SS2 since there's very little evidence suggesting otherwise.