ktm 250 adv vs 390 adv

new rider here just learnt the basics on splendor for 1 month thinking about getting an adv. is there any difference in the chassis/off road capabilities in ktm 250 vs 390. i feel 45 bph will be difficult for me to handle so i am more inclined towards 250 but first will learn on splendor for 2-3 months. also why there so much hype for 390 adv and nobody talks much about 250.