Different ways to access Miiverse

There are currently 3 different ways to access Miiverse. With the Wii U, 3DS, or Web browser. Each of these has different capabilities and load time speeds.

Differences
Each different version can do certain things, here's a list of differences:

Friend request:

Wii U: yes/3DS: no/browser: no

View friend lists:

Wii U: yes/3DS: no/browser: yes

Block people:

Wii U: yes/3DS: yes/browser: no

Use private messages:

Wii U: yes/3DS: no/browser: no

Handwriting posts:

Wii U: yes/3DS: yes/browser: no

Everything else is possible among all 3 versions. The Wii U is the definitive version of Miiverse, and there are no capabilities that it doesn't have that other versions do, because it is the original version. The browser version is often most convinient for its speed and by the fact that it covers most abilities.

Speed
The speed of each version of Miiverse is somewhat debated. This is probably due to how different people have different connection speeds. Though it is most commonly believed that 3DS Miiverse is the slowest version by far, and that browser Miiverse is the fastest, though some argue that Wii U is faster