I finally finished the game story so now I can review it (not that my reviews are ever detailed) :3
Overall I enjoyed Digimon Cyber Sleuth: Complete Edition which is 2 rpg games in one with Cyber Sleuth as the main game and Hacker's Memory as a side story sequel seeing the main story play out through the eyes of a different cast of characters.

Now for the in depth review :D
Gameplay
The combat system on both games are same. It's a turn base combat with 2 different core components effecting damage output with digimon having 4 types of attributes and 8 elements including neutral for both attribute and element that has no weakness or advantage.
Your character gets Hacking Skills which they can use in dungeons to do various things from removing roadblocks, solving puzzles, and adjusting enemy encounters. They added more features in Hacker's Memory like to make the character run faster and an entrance warp that's very useful and wasn't in Cyber Sleuth.

Digimon
There are over 300 digimon in the roster to collect. Digital monsters require memory space to be put in your digivice so the amount of digimon you can carry and how strong they are at first are very limited because the further they are in their evolution they eat up more memory space.
You have a max capacity to carry 11 digimon at once as long as you have enough memory and a fighting party of 3 that will be shown running around following you in dungeons while the others are in reserve.
https://node2.projectplanet.cn/@steamcommunity.com/sharedfiles/filedetails/?id=1895905321
Every single digimon has a special move with special animation movements with some Mega digimon having 2 special animated moves. Digievolution is more of a branching tree that you control than a single evolution line. In order to digivolve you need the digimon to be at a certain level and meet certain stat requirements, you can also revert an evolution for vaious reason like increasing max lvl capacity to get stats up or to increase ABI to get special rare storing digimon.

Story
Cyber Sleuth: To be honest, as epic as the overall plot is I feel like the structure was poorly paced and executed. While there are a lot of strong quirky characters their bonds feel forced by the plot because they don't even know each other that well or even interact that much unless they need us to do something for them or we got involved with something serious. It's still a decent story but it's just messy in getting to the point and most of the fluff story that aren't serious barely gives any character development for anyone and are just basically whacky adventures.

Hacker's Memory: This was more character driven than plot driven and because this is a side story happening at the same time as the main plot it heavily referances Cyber Sleuth events and many side characters reappear here and we even see what some of them do behind the scene while the MC in Cyber Sleuth was doing their thing. Since it's character driven the stakes feel less grand but more personal, with the MC having his own motives and thoughts most of the time even while still being a silent protag. Being in a team make the characters feel like they have a real bond that grows over time. So basically it's kind of like a look of the world of Cyber Sleuth through a completely different prespective of people that aren't in the center of serious incidents.

If it isn't obvious I'm personally bias and love Hacker's Memory more overall. It reminds me a lot of Durarara in many ways from the doubtful but determined MC to the base of operations being in Ikebukuro and seeing how many characters that seem unrelated are all somehow connected.
Anyway I recommend this game for JRPG fans.