Stability of carbocations and inductive effect

[Prashasti]

Which carbocation is more stable?
1) CH3-C+=CH2
2) CH3-CH+-CH3

Basically, I want to know whether the =CH2 group is electron donating or electron withdrawing. Does it show +I effect like alkyl groups?
I mean, like in 2) the carbocation will get stabilised due to the electron donating power of alkyl groups (as it shows +I effect).

 

[Ygggdrasil]

What type of orbital is left empty in each case (hint: consider the hybridization of the central carbon)? Which type of orbital will be less stable with a positive charge?

For the answer you can read this page: http://www.masterorganicchemistry.com/2011/03/21/three-factors-that-destabilize-carbocations/