Nearly always safer to enter from the right! I’ll only go down the left if the lights have just turned red and there’s no chance of vehicles pulling away as I’m filtering.
I actually think asls are lethal, as are on-road cycle lanes, as they encourage cyclists to undertake large vehicles and stop just in front of them, or if the asl is full, stop just on the near side. Both are blind spots for hgv drivers and cyclists have been killed whilst using them perfectly legally. Fumey maybe, but nearly always safer to wait behind something big.