When lolreplays came out there was a red riot response in the forums that said they checked code and nothing untoward was present. Since baron replays is from taiwan, i've wondered if there was ever any similar comments about code being open and reviewed?
I'm not backing one over the other, personally I haven't been able to use lolreplays since season 3 due to some install issue. Tried newer version including recent one and get config error wont run. So I wouldnt mind myself using baron replays but would be nice if I had some idea of whether a riot code monkey has reviewed it.