Low Stakes NL vs. S&G

I'm trying to figure out which is better to invest my bankroll in. Right now, I have about $250. I usually play $10 S&G and if I did play cash games, this amount of cash, would put me in a NL25 (if that). Do you only play cash games when you have alot of cash because I notice if I play at these stakes, most people disregard what they/play call raises with because its only another .75-$1 for a raise. Many times my overpairs are beat on these tables by much weaker cards KK/vs. J/8 hitting two pair or QQ/vs. A/5 on a 3/5/5 flop. I know all this could just be the normal swings but should do you advise sticking to S&G's until I have a larger roll?

$250 should be enough to start at 25NL if you can play poker.
If its too tough then start a little lower but i doubt it will be if youve played your share of tournaments.
Just wait for good hands and watch them get paid. If KK gets called by anything then raise a little more with it. If someone is willing to call half their stack with A5 when you hold QQ then raise to half their stack.

Stick to SnG if you are better at SnGs. If you are better at cash games then stick to those. Thats my advice. If people disregard what they play/call raises with then that can only be good for you. Get a good hand and raise with it and get called.

my 0.02

For most people cash games are more consistant money-makers, as long as you aren't prone to tilting and losing large amounts per session.