Roman and Remus are canonically the same height as well as the tallest. Deceit is shown to be shorter than the Creativitwins but taller than Logan. In the Christmas episode Virgil is just slightly shorter than Roman, but when you compare the different he would be taller than Deceit.

In short, the order of height is....

1. The Creativitwins (Roman/Remus)
2. Virgil
3. Deceit
4. Probably Logan
5. Probably Patton

It's harder to tell whose taller out of the last two. Looking at pictures, Logan looks taller, but I refuse to accept that. I believe Logan is the shortest and no one can stop me until Thomas makes it clear in a video.

Logan is short and Virgil is tall. End of story.