1 sphere pros:

• aerodynamic
• rolling
• totally ballular

1 sphere cons:

• less surface area = hotter
• can be mistaken for other kinds of spheres, like Bakugan or planets
• cant wear standard size hats

stack pros:

• last in first out
• balls hehe
• good posture
• imposing

stack cons:

• higher latency
• can fall over
• unnatural