basically the same but this time it's my reccommendation on when to move up from the 2-x free battle. Like Always I usually go wto the next free stage wghen the highest level of the current FS I'm using to level up gives less than 10 exp when defeated. The easy leveling is basically that as it is the safer way and don't require Assist Defence from a stronger Ally. FOr the Faster one You will need AD to be safe and i usually doe 2-1 FB to see if the one I'm leveling can skipp to 2-3 as well as increase affection incase I have not gotten AD for both pair.
Dobermon is a good one to have for free players as his 2 attributes are the same as Omegamon and will help balance out with the Unknown enemies in Maze that is weak against light. Also, he is one of the 2 easy base rides to help stop Stamina Decrease in the field with the 2 best Base Rides being KaiserGreymon and MagnaGarurumon who I heard has a ride like MetalGarurumon and Vikemon Letting you recover Stamina while you ride them and pass Aggressive enemies. Plus they are possibly faster than Vike and other Mode Selector Rides as they have their own Riding Item in the Cash Shop.
Got VERY lucky in floor 50's Crystal as I got my 1st +30 Drop 1H Sword and was even able to record it here for video proof. Truly lucky as when I tried farming floor 50 many times later I never got a +30 Special Bonus Weapon anymore.