Cobra 135vs 139

I recently bought a cobra 135 for $3. I'm wondering how this radio compares to the 139, 139xlr and 2000gtl? I know the xlr and gtl have 40 channels and mine only has 23. But now I'm thinking about buying a 40 channel but dont know which one is better. Any info helps.

 

Which radio came out first out of 135, 139, and 139xlr? I forgot to add the 135xlr into the comparison.

 

To my understanding the 135 was the last 23 channel radio made by cobra as a base station. Which in my opinion might make it the best in this category?

 

In what way was the 135 better than the 139?

 

Good to know that I got a good radio that works and it's not the lower version. (If not I'll have to buy the nicer one hehe) Do you guys know if the cobra 40 channel base station is good? I'm a big fan of the looks of the cobra 2000gtl but maybe another brand is better?

I linked a picture of the 139 radio and a url for the 135. They both have a slightly different looking chassis.
Cobra 135

 

Link for the 139 Cobra 139