I tried to search the forum and google for this, but I haven't found much information - I'm probably looking in the wrong spots! I know they they are similar size and looking at the catalogues posted here on the site they appear to constructed pretty similar. I already have an Optimus 45 and a Primus 96 and I was looking for something in the mid size range because this hobby is addicting! Anyway, should I have any preference between the stoves or are they more or less equal? I found one post here that mentioned the threads where the riser tube attaches may be different between the two depending on the year the stove was made.