Juventus becomes the best club for him next season. Lukaku have two best options for now.
1 Juventus
2 Saudi clubs
I don't see a better choice than those. I hope lukaku will able to decide it as soon as possible.
Lukaku have rejected with all interested from Saudi Clubs and seems he won't play there any more right now although has chance for few years later depend on how excited salary accepted. Last option for Lukaku between returning back to Chelsea or join with Juventus next season but need waiting done deal transfer fees with Chelsea. Its not easy for getting done deal about transfer fees after Inter Milan withdrew for signing Lukaku after second proposal with 35 million euro rejected by Chelsea.
Juventus is bigger teams and Lukaku have been adapted well with Serie A competition, its not difficult for adapting again for Lukaku if join with Inter Milan rival teams next season because regular position is most important for Lukaku than returning back to Chelsea where difficult to be main player under Pochettino.
what a tragic future for lukaku, reportedly juventus fans are busy doing rejection of lukaku, that's because lukaku once made a statement that he would never play for any other club in the italian league besides inter milan.
with the current uncertainty of his future if I become lukaku then I will prefer the Saudi league because they are willing to pay lukaku with quite high money, besides that now lukaku is over 30 years old and usually the big European teams don't really like players who already senior like him.
Like I said before we are just paying too much attention to Lukaku while he is a 30y old player he can't be a player in the next season for any team and because of his age he can't be a good investment too.
I saw Inter Milan wanted to do anything to hire Lukaku and Juventus also wants to hire this player and there was some news even from Ac Milan to hire this forward so they can find younger and better players instead of Lukaku.