Best grout for bathroom/shower ?

[Mgriffy61]

So bathroom has had the old grout removed to a depth of about 4mm. Now need to start thinking of re-grouting.
Tiles have approx 4mm gap and looking for a white, water resistant, smooth finish grout that is easy for a first timer to use. Need to avoid pin pricking.
What do you guys suggest and why ?

 

[Qwerty]

Kerakoll Fugalite bio all day long. It doesnt perform any different to Mapei, but is far easier to use