I personally prefer Timid because outspeeding Scarf Terrakion / Latios is pretty big as these are generally big threats to Sun Teams. Terrakion revenges Ninetales, Venusaur, Heatran, Adamant Sawsbuck which are all pretty common on Sun Teams. Latios on the other hand outspeeds most common chlorophyll users when Scarfed, and spam Draco Meteors easily, given that the only common Steels used in Sun Teams to resist Draco Meteor are Heatran and Forretress, who both lack reliable recovery. Outspeeding +2 Volcarona is also pretty big, as it hurts a lot of Sun teams that don't carry that many answers to it, and Volcarona generally starts to set up when its counters are gone. The extra power is nice with Modest, but you still don't really miss any OHKOs you would with Modest after a Growth, while outspeeding other scarfers is very important. Another thing I like about running Timid on Venusaur, is that you only really need to run 180 Speed to outspeed everything up to Scarf Latios, while substituting the remaining 76 EVs into HP or Defense to help Venusaur take priority a little better.