In terms of mobile gaming. I prefer to you a more expensive android phone like Asus Rog 3 that you could satisfy your gaming experience if you're rich enough to buy expensive phones. I also recommend to you to buy an IOS like tab.
On those two gadgets you can satisfy yourself what ever game you may play online or offline.
• In addition gaming processor is the most important for gaming like Helio
from affordable android phones that less than 200 bucks.
• RAM is also important for smoothness of the game. 8gb ram would be enough.
• ROM also important the higher the ROM the better you could install even 10 different games with large files.
• The HFR or all we know High Frame Rate is very important it's for the smoothness of scrolling , 90fps to 120fps is good enough.
• Also always review from fb groups the feedback about the phone you desire to buy. These tips could help you to avoid any regrets.
* Pubg Mobile is one of the best game I've ever played on my phone so I recommend it to you.
* But it always depends on you, there are different types of games that could suit your interest like Role Playing Games.
The list of RPG that I played before.
Black desert Mobile
Walk Online (ran online mobile version) beta
Perfect World VNG
Ragnarok M : Eternal Love
*In offline you could download
NBA2K21
WARRIORS
GTA San andreas
GTA vice city