I have mostly corns but started with garters. The only reason I have mostly corns is because I am fascinated by the genetics.

I think everyone has given you excellent feedback on the pros and cons of both. I think corns will be easier for your boys to handle. If you decide the buy a corn make sure you buy one from a reputable breeder, the snake has eaten at least 3 - 5 times and it is eating frozen thawed pinkies.

I have/had red sided garters, eastern blacknecks, checkered garters and a ribbon snake. Some have been muskers, some biters and some dog tame and would just hang out with you. There was no rhyme or reason to their "personality". They are more interesting to watch in their enclosures but I have some that stay hidden. I have also had more feeding issues with my garters who like to take winter breaks from eating despite the fact that their temps and lighting does not change.

Besides the fact that an adult corn will need a larger enclosure than a garter the corn will have a longer lifespan. Their needs are otherwise pretty similar.

I think one of each is the way to go! (And I happen to have an adult and a baby hyposnow (coral snow) available.... )