If you had to choose 17
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Sexy concept and more mature age idols come back (17) 100%
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No sexy concepts but more minor idols flooding the industry (0) 0%
Sexy became one of the most despised concepts by the majority of kpop fans once they realized non-Big 3 girl groups were able to gain success with it (SISTAR, GsD, AOA, EXID). You know how it goes with kpop fans, especially the 2nd gen variety, they hate seeing the small ones make it big. So by the start of 3rd gen companies were afraid of the backlash against sexy so they tailored their groups towards cute concepts (thanks to APink's popularity) or the new trend "girl crush". Eventually the market became saturated with just those two concepts and there was little novelty left. So companies hopped into a new trend, which was debuting younger and younger idols. And it was successful because 20+ year old female fans took a lot of affection towards them (Wonyoung, Leeseo, Haerin, Boeun). Now that the floodgates have been opened, kpop fans are apprehensive about calling out the avalanche of minor idols because Big 4s are doing it too. This has been the unfortunate trade off kpop fans found themselves in. If they had any foresight they would have realized sexy concepts keeps the industry from having to debut too many underage idols as they are now.