It would help to know what stakes, # of players, live/online etc... but here is a basic overview of where the strength of suited connectors lie.
First lets compare the difference, that may at first glance seem negligible, between T9s (true connector) and T7s (Two gapper).
To the naked eye and inexperienced player, those hands are close to the same rank. (Obviously thinking that T9s is better but hardly)
Before we dig deeper into the difference in such hands, lets discuss where the value of these type of hands comes from.
Like pocket pairs, these types of hands are very suitable for speculating, meaning you ideally want to see the flop as cheaply as possible. But whereas with 55 your trying to hit a set against (hopefully) an overpair to get them to stack off, the suited connectors let you hit a piece of the flop a high percentage of the time and be able to continue past the flop a lot. The ability to be able to continue on turns and rivers gets exponentially more beneficial as the stacks get deeper. Think about getting to the river with AA 300bb deep, are you ever comfortable on a non A flop after someones called twice?
But note that to be successfully speculate, you have to know which flops to continue on and which ones to just bail. Which brings us back to our discussion on the difference between certain "connectors."
Obv the higher the suited connector the better (QJ>JT>9T etc...) but also the less gappy it is the better as well (T9>T8>T7), this goes beyond the fact that 9TvT7 is a better hand one vs one, but also the amount of flops and turns we can continue on.
T9 can flop a straight 4 different ways. (678, 78J, 8JQ, & JQK)
It can flop an Open-Ended Straight Draw 3 different ways. (78x, 8Jx, & JQx)
It can flop a gut-shot straight draw 5 different ways. (68x, 67x, 7Jx, JKx, Q8x)
T7can flop a straight only 2 different ways (689, 89J)
It can flop an open ended straight draw only 1 way (89x)
It can flop a gutshot straight draw only 4 ways (68x,8Jx,J9x,69x)
So as you can see, not only is there the added benefit of your kicker card being higher, the real value with these hands is being able to get to turns and rivers profitably, and the more connected it is, the more flops and turns you can peel profitably.
This will also do wonders for the times you are calling down with what may be a pretty visible range(i.e. top or mid pair hands). It will leave him questioning on rivers whether you've been calling down with a pair or now has to wonder if you have 67s instead, so it makes his life a hell of a lot more difficult.
I could go on and on, but i'm running out of attention, lol damn ADD. Hope any of this helped!