For those unfamiliar with my notation, 'KTx' refers to a king ten with another suited card that is far enough away from the 'KT' that it's not part of a 3-card straight flush or 3-card royal flush draw. Specifically, this means 'KT2' - 'KT8'
'QTx' would mean 'QT2' - 'QT7'
The simplest answer to OTABILL's question is 'QT' is considerably more valuable than 'KT', because of additional straights and straight flushes it's part of. 'QT' is much better than 'QTx' in this game. The only games I know of where 'QTx' is held are games where flushes return 7-for-1, and also 9/6 DDB Ultimate X where you get such a big multiplier for connecting on a flush that you go for it more.
'KT' is barely eligible to be held in most games (just as 'AT' is barely ineligible to be held in most games.) The correct play to 'KTx' can be one, two, or three cards. In versions of Deuces Wild where flushes pay 2-for-1, usually you hold zero cards.