Depends on what you like about each, all have there ups and downs, I do not have the R200, but do have the Xcube2 and the 220hpriv, here are some cons and pros of each.
Ipv5 Pros, Nice chip, good 510, pretty good battery efficiency.
Cons, Size, Finish, some had the 75 w. bug, (mine did not).
Smok R200, do not have, I belive it has the same type of functions of the Xcube2, Kooper Plus, Hpriv,
Pros, updates, better accuracy in temp. lots of menu options. TCR, lots of memory settings. Size.
Cons, can be a pain with the menu, takes quite a few clicks to get it set up were you want it.
Cuboid Pros, updates, easy to use menu,dual battery meter, TCR.
Cuboid Cons, Short 510, Not the most efficiant in battery life,
These are my pros and cons that effect me the most, all are good devices for the money, all do temp in NI,TI and S.S., I don't belive any are balenced charging, I never use onboard charging anyway. In conclusion I think you would be ok with all of them just figure out what style you like best.