hmm i own themaposter , ultraposter and multiposter

themaposter = best one and most accurate highest level of updates and bug fixes

ultraposter = importantly its unique the auto register feature works well also you can load a list of site and detect what board its using without doing 1 by 1 but its fucking expensive and the support sucks

multiposter = this poster is the best to run megathreads in forums which any other poster cannot do because multiposter has the ability to edit/check dead links/replace dead links of already posted threads

i would say go for thema or multiposter blend , ultraposter is just a white elephant