Boobs are queen, then butts and then bellies. I'm actually not that into big bellies, I like a nice plump chubby belly but I usually don't like when they dominate the figure. It depends some artists are good at drawing them, it can also depends of the art style and type of character.

Now if I'm being honest, I am a boob man thru and thru and I find them incredibly attractive but if you mean what I find sexier then I d say I find Thick Thighs and Wide Hips sexier then Boobs or Butts. Something about thicc strong athletic legs and wide whips are very sexy.
"But what about Butts? aren't they part of thighs and hips?" I hear you cry out, well sometimes, see big butts need hips and thighs but wide hips and thick thighs don't need big butts, their nice but not necessary. imagine a drawing of a very skinny girl, now imagine her with expanded exaggerated wide hips, its pretty hot, reset and now take that skinny girl and only expand her thighs, still pretty hot, reset and give her huge boobs and its very hot, reset again and only expand her butt but not her hips and thighs, its kinda weird looking right? you can only make them so big before it looks really odd, you need bigger hips and thighs to go with the huge booty but hips and thighs can look good on their own, At least that's what I think lol