at 1oNL, and maybe at 25NL, 3betting isnt a priority, imo. i dont have an easy time with 25, so take that for what its worth, but i beat 10NL 6max over 25k hands at over a 10.

basic fr play will beat both at 10NL. just focus on playing the top 1/4 of starting hands, and dont call raises pf w/o strength. believe the aggression post flop, most times, and only semi bluff nut draws with 8+ outs (play those like TPTK), and you'll turn out just fine.

25NL, i am still adjusting to; hence, the OP.