They're both equally yummy. Here's my analysis of some of the available flavours

Movenpick ^
1) Straciatella - consistent, smooth, chocolate bits just the right size

Movenpick
1) Strawberry - sour to the point of being spine curdling.
2) Never hard/solid enough (maybe the freezer doesn't work well enough or something)

Haagen Dazs ^
Strawberry - nice chunky bits of fruit. Creamy.

Haagen Dazs
Poor selection, and my favourite flavour chocolate always runs out

My 2 cents