Inv's strong point really isn't the Resistance 
It's the (when played right, capped) defense it gets when surrounded by large number of enemies when using Invincibility. There is a slider in Mids' that allows you to increase the number of targets affected in Invincibility. Take a look how the defense numbers go up. a 45% or higher defense means you get hit 5% of the time unless the enemy has some form of +tohit (which are rare cases). The weak spot of Inv is psi.
This doesn't mean that Inv is better than Elec. Just wanted to point out what you had missed They're both great, but they're a bit different in what they're great at.
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Recently downloaded mids to help with making my first Brute and I was experimenting with brute secondaries. I found that Inv compared to Elec once slotted only provided an extra 11% resistance against S/L damage than elec did.
Elec has capped energy resistance and over double resistance against fire,cold and a lovely 41% resist to Psionic. The only ***** in elecs armor I can see is no self heal and the toxic resist. (Well lack of..)
Im a noob when it comes to Brutes and Mids so a little help would be appreciated if anyone else has any experience. Im not so bothered about min/max build. I just wanna be able to solo and team well.
47 Month Vet
Main: Sullster: Level 51 STJ/SR Speedster