Witch Watch Or 2.5 Lillel? What Should I Choose At The Book Store?

I have $40  Bucks To Buy One Book, should I get Witch Watch or 2.5 Lillel At The Japanese Bookstore?

Although, Books At This Store Cost Like Around 15-14 Dollars, I Should Probably Maybe Get Witch Watch, Since The Volumes Are Colorful And Well Designed, Maybe 2 Won't Hurt A Bit, I Think The Japanese Manga Might Cost 13-14 Dollars, Or 3 May Count (Since 13+14+15 = 40) I Don't Know Prices... So We Will See...