There are too many robot-android girls that really make more than one person fall in love.
But for you, which one is the best?

For me it would be Uzi (Murder Drones)
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Fiora from Xenoblade 1
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I like J more, because pigtails and nerdy bitch.
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Also Haydee because godDAYUM is that toaster thick, and Robo-Fortune because funny robot catgirl.
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You cannot mention robobitches without referencing the GOAT:
WOULD fuck the shit outta any robot that zzzhodazzz has drawn.
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Probably gonna get my dick crushed by one of those girls, but it's worth it.

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Arcee is the best fembots especially when she has a femcock

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Probably 2B

Gotta go with Aigis from Persona 3, especially with Reloaded coming out soon.

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Vivy: rule34.xxx/index.php?page=post&s=view&id=8602943

Compared to other franchises (even its own) it is by no means the best, but I love Elita-one:

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Uzi from Murder Drones as well for me, She just kinda makes me gay panic and I like her :)

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Obviously 2B and 2P.

Vivy from Vivy: Fluorite Eye’s Song, great anime I can recommend it.

Either XJ9 or Brass from Medabots

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Android 18 from dragonball z is best mecha-waifu