@robertklaschka @onepict @urlyman well I've not investigated as I hope some journalists are in the process of doing…
But a glaring difference is tactical.vote is a tactical voting website who give a long explanation why they suggest voting Green, while 'tactical-choice' is a fictional entity that appeared in Labour's own campaign material (presumably spooked by tactical.vote's call).
How are the Green's supposed to have infiltrated the Labour campaign in order to produce Labour campaign material with a fake website making a fake claim to make Labour look bad? It's quite a complicated, spy-cops level conspiracy the Greens would have had to orchestrate…