You should consider the Oracle, the KH and the Qu-Ax QX RGB.
The KH I would only personally consider if you want to have a Schlumpf hub. (But there is a adapter in the making, so you can have a internal disc and the Schlumpf hun would fit also into the QX RGB uni then).
The Oracle is comes with a nice price for great value. But has 125 mm between the bearings.
(I combined a 125 mm with KH spirit cranks that have a huge Q-factor and due too that I got lots of knee pain, but before I had cranks without Q-factor, worked good for me then)
I recently got the QX RGB with the lighter tube and tire and with T-bar and it only weights 6.8 to 7 kg. If you looking for the lightest 36" on the market and you don’t want to go into carbon it is the QX. The saddle is great, accepted as compftable by a lot of unicyclists. The saddle also has a KH base,
so you can easily mount a T-bar. Your legs are very narrow together, the Q-factor is very low (and that resolved my knee pain I had on my previous 36" completely). And it has a hub interface that doesn’t wear so fast out like the ISIS interface.
In my eyes a unicycle is mostly defined by weight, the right saddle and the crank length.
Compared to old school 36" all are light.
Without a comfortable saddle you will not have a lot of fun riding, you can always ask the shop can exchange the saddle for you. The KH fusion one (that comes with the KH 36") takes some of time to get used too and it’s not Everbody favorite. The Nimbus Stadium (that comes with the Oracle) is a hard saddle, they are only few who like the saddle. The QX eleven (that comes with the QX RGB) is a saddle widely excepted by a lot of unicyclists. Has the classic form of a KH saddle, foam is not to soft nor to hard and in comparison to the KH Freeride it doesn’t become a sponge when wet.
The crank size: I definitely recommend dual cranks. For the first month you probably want to start with some longer cranks and then go shorter. The longer hole is always also great for hilly terrain and Muni and the shorter cranks for flatter road riding and riding faster. I really liked the 137/117 length on my nimbus and now the 136/110 for my QX. Going bellow 110 mm up to 90 mm is fun, but also takes a lot of skill and in my eyes doesn’t make sense if you don’t race.
Nimbus has even tribble cranks. But in my eyes 150 is way too long on any unicycle. 100 is very very short, you would probably not be using it. And 125 mm is a great size and compromise if you never want change crank length and want to have some speed and some power on uphills.