What is/are your main speedcube(s)?

I see a lot of people have switched from Type A DIY cubes to Type D DIY cubes. Could people tell me the main difference why you switched? Because I'm planning to buy my first DIY (I've never used one), and I don't want to buy one where another one could be better? Thanks. (Also, why are Type Ds so cheap?)
 
My cubes for getting my best times are:

1x1x1 Custom Cubes cube (I know this is a joke to some)
2x2x2 ES white cube
3x3x3 Dian Sheng white cube
4x4x4 ES white cube
5x5x5 ES white/black cube
6x6x6 Gabbasoft cube (I can't afford a real V-Cube 6, same as for V-Cube 5)
7x7x7 V-Cube 7
 
2x2: Wen Sheng 2x2
3x3: type F clone (?), breaking in my Rubik's brand
4x4: ES clone, but I need a better one
Pyraminx: Magic Cube pyraminx
 
2x2: Eastsheen Black
3x3: Storebought
4x4: Eastsheen Black
5x5: Eastsheen Black
Megaminx: Chinaminx :D
Square-1: White DIY from cubefans
Pyraminx: White from Cubefans
Magic: Store bought
 
2x2: ES
3x3: Edison and Storebought interchangeably
4x4: mefferts
3x3 OH:diansheng
5x5 and up:v-cube
 
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