basically there the exact same bike, very minor differences, the new lxr is proberly abit different.
the motovert is acutally just a relabeled psto.
only difference from memory is the frame is abit longer and taller on the psto/motovert and the pegs are abit higher.
i've ridden reefys PSTO, it had marzocchi forks and revalved rear shock. really good bike, think i like it abit more then my lxr as it felt abit bigger and more comfortable. altho i have the first lxr ever so smaller frame and swingarm then the current ones.
mines setup the same as his and there pretty much identical just can tell the difference with the pegmount height and frame length.
he has cracked the frame on it a couple of times but he was jumping a massive double that not alot of 250f's do, reason was some had a 2cm wide engine mount bit and newer one had 3cm. the 3cm one hasn't had an issue yet.
i haven't seen/ridden the newest lxr but i'd look at that and the motovert and see which one you like most. not alot of difference between the two. its pretty much a direct copy of the lxr and built in the same factory.
pull off the seat on the psto/motovert it says pitster pro lol
either way great upgrade over a crf50 style, heaps easier to ride