I just saw this so I will throw my 2 cents in.... for triple draw you really want a 2 and a 7 in your hand and avoid hands like 3456 or 4567, 2 draw starting hands like 237 and 247 are better than 1 draw hands like 2456 and 4578 etc. when you have 3 draws left ..... 1 draw hands like 2347, 2357 and 2367 are really strong drawing hands and should play them really aggressively, especially in position.... if you get dealt a hand like 2379K or 2479Q, you should toss 2 and not draw to a 9 to start with, the only time you you only toss 1 and draw to the 9 is if you are on your last draw or of course in 2-7 NL single draw..... hands like 22247 or 23777 are also really good starting hands because you are discarding really strong cards that your opponents cannot get.
For example if you get dealt 22247 and discard 2 deuces and receive the last deuce, it is impossible for your opponents to have a 7 lo because all the deuces are gone and you can't have a 7 lo without a deuce, it also kills the possibility of them having strong 8 lo's like 23458 or 23568 so the best hand they can have is a 34568, you might even want to pat and snow given that they cannot have a really strong hand, but I would only do that when you know your opponents well enough.
For 2-7 NL single draw, pat 9 and 10's are pretty strong hands unlike triple draw, breakable hands like 2457J are really good hands to play aggressively in position, for example if you 3 bet someone in position with 2457J and they call, if they draw 1 you can pat but if they pat you can discard the Jack and draw to a 7. Position is important in any form of poker but in 2-7 single draw it is a MASSIVE advantage imo..... unlike triple draw where a 8 lo is usually the winning hand, a 9, 10 or J lo has a good chance of winning the pot.
I also think that there is (as there should be) a lot more bluffing in 2-7 single draw than other poker variations and because of that it is the purist form of poker there is and just love it.... a lot of the times it just comes down to whether they have it or not, for example a common hand is where both players draw 1 card and if the player out of position checks post-draw and the player in position bets, they are polarized because most of the time they will check back if they got an ace, king, queen or jack (although some players will bet a jack), so they usually have a strong hand OR paired up and can only win if they bet
Anyways that's my 2 cents and hopefully helps at least a little bit, good luck at the tables !!