Turn A - Flopped over here badly, hardly sold any Kits.
Seed Gundam - Did a few was not impressed very low grade, IMHO
W-Gundam are very decent kits both in the 1/100 scale and the 1/144 ranges.
Honestly do yourself a favour and check the parts and Instruction sheets between the 1/144 and the 1/100 Kits, you will see the difference in detail and how they build up straight from the box.
Also check the articles in Hobby japan about how the guys out here mod the kits and build them up.
If it just numbers of Kits you want go for the 1/144 but don't be disappointed if the don't look 'cool'.
The 1/100 Kits will build up nice and most proably 1 kit will take you longer than 3 1/144 ones to finish.
In the end the decision and money is yours.
My recommendation is a good 1/100 or MG kit over a 1/144 one any day.