Yes D09C requires more effort to play. It has harder sponge than T05 and on slow strokes will be slower, T05 has catapult on all strokes and with small stroke ball flies fast while D09C requires hard hit to generate speed.
If you have excellent touch then playing with T05 will be easier as it doesn't require much effort.
For instance blocks with T05 are easier with less effort and more pace (if you don't pop them up or if they don't fly over the table).
Playing away from the table requires less effort too.
Passive blocks are weird with D09C and not so easy.
Biggest advantage for me with D09C is play over the table: short play, flicks, opening underpins, serve receive. Tackiness and low bounciness helps, I fell I can "guide" the ball in desired direction while T05 catapults the ball immediately and requires precise contact.
For passive serve recieves D09C is much more fogiving than T05. Also attacking any serve with D09C is best of any rubber I tried. It's like almost just going through the ball no mater what spin is on it. With D09C in general it's easier for me to counterloop through opponent spin and keep the ball on the table.
Looping underspin is great with D09C, T05 is also very good in that regard but I feel I can place the ball more precise and more safely with D09C.
In summary I would recommend D09C over T05 for aggressive players that play close to the table and like to initiate attack on each ball, maybe have trouble reading opponent spin and don't have perfect touch but are quick enough to generate pace with full strokes with their body.
I would recommend T05 over D09C for players that play far from the table or players who have a good touch, read opponent spin well and want to generate good pace with physically less demanding small strokes. Also to blockers and people who play lot of fishing and lobbing.
All this comparison is on forehand, haven't played D09C on backhand.