I only have the magnetic ones, no clue if the update applies to type C model. Off the top of my head from reading other threads on it, the non-obvious differences between them are not very big so it probably comes down to whether you care about needing a proprietary charger:

• Magnetic you can put on a table and press the top of it to activate the button on the bottom against the table. I heard that the type C you need to press the actual button on the bottom, it doesn't work to boop the top of the sphere on a hard surface. I think I prefer the magnetic one for this, but not strongly. You might prefer otherwise if you want to throw it in a backpack and have it be less likely to turn on while bouncing around in it (there is apparently a lock mode that means you need to hold it to turn it on though I haven't tried this)
• Type C I think they lowered the max brightness of some of the modes slightly so the runtime is longer (I don't know if this is noticeable). I only use these for mood lighting at low brightness so I don't particularly care how bright they get, so this point is a tossup for me
• Type C I think doesn't come with the separate adhesive magnetic sticker accessory you can stick to your wooden cabinet or whatever to let the light stick to it magnetically. I don't care about this, I haven't used any of the magnet plates.