I've planted some Chinese Tallow and olive trees, currently about 1.2 metres high and years away from bearing fruit. By that time oil from algae will have been proven or disproven. I think trees have a resilience advantage over slime insofar as they reduce contamination or predation of their lipid producing organs, which then dry in the sun. The problem is slow growth and harvesting effort.

However I'd have to say that oil from trees is a novelty not a large scale solution. Transport must be electrified and the need for liquid fuels (eg aircraft, range extended PHEVs) must come from thermochemical processing of nonfood biomass.