Henry more creative, better technique, better dribbler, passer, free kicks, long range goals. I'm struggling to see what Mbappe is better at.
The most important thing, endproduct!
In all tournaments for both club and country Mbappe creates more and scores more, a lot more.
They both play(ed) mainly as CF or LW/RW.
Henry when he turned 24 for clubs:
Monaco: 28 goals and 3 assists in 141 matches (7335 minutes) - 0,34 goals/90 and 0,38 goals+assists/90
Juve: 3 goals and 2 assists in 21 matches (1388 minutes) - 0,19 goals/90 and 0,32 goals+assists/90
Arsenal: 48 goals and 20 assists in 100 matches (7380 minutes) - 0,58 goals/90 and 0,83 goals+assists/90
Total 79 goals and 25 assists in 260 matches (16022 minutes) 0,44 goals/90 and 0,58 goals+assists/90
Henry for Arsenal (peak):
228 goals and 103 assists in 376 matches (30439 minutes) - 0,67 goals/90 and 0,98 goals+assists/90 (0,30 assists/90)
Henry for Barca:
49 goals and 27 assists in 121 matches (8545 minutes) - 0,52 goals/90 and 0,80 goals+assists/90
Mbappe so far for clubs:
Monaco: 27 goals and 16 assists in 60 matches (3275 minutes) - 0,74 goals/90 and 1,18 goals+assists/90
PSG: 190 goals and 93 assists in 237 matches (18937 minutes) - 0,90 goals/90 and 1,35 goals+assists/90
Total: 217 goals and 109 assists in 297 matches (22212 minutes) - 0,88 goals/90 and 1,32 goals+assists/90 (0,44 assists/90)
Henry when he turned 24 for France:
10 goals and 3 assists in 29 matches (1918 minutes) - 0,47 goals/90 and 0,61 goals+assists/90
In WC-98: 3 goals (South Africa (1) and Saudi Arabia (2) in group stages) and 0 assists in 6 matches (366 minutes) - 0,74 goals/90 and 0,74 goals+assists/90
0 goals in KO stages and sat on the bench for 90 minutes in the final.
In EURO-2000: 3 goals (2 in group stages and 1 against Portugal in the semi) and 1 assists in 5 matches (470 minutes) - 0,57 goals/90 and 0,77 goals+assists/90
Total in group stage: 5 goals and 1 assist in 5 games (367 minutes) - 1,23 goals/90 and 1,47 goals+assists/90
Total in KO stages: 1 goal and 0 assists in 6 games (469 minutes) - 0,19 goals/90 and 0,19 goals+assists/90
Mbappe so far for France:
33 goals and 22 assists in 63 matches (4645 minutes) - 0,64 goals/90 and 1,07 goals+assists/90
In WC: 9 goals (4 in group stage - 5 in KO stage) and 3 assists in 11 matches (831 minutes) - 0,98 goals/90 and 1,30 goals+assists/90
In EURO: 0 goals and 2 assists in 4 matches (390 minutes) - 0 goals/90 and 0,46 goals+assists/90
Total in group stage: 4 goals and 2 assists in 9 matches (654 minutes) - 0,55 goals/90 and 0,83 goals+assists/90
Total in KO stages: 5 goals and 3 assists in 6 matches (567 minutes) - 0,79 goals/90 and 1,27 goals+assists/90
Henry vs. Mbappe in the CL:
Henry: 50 goals and 22 assists in 112 matches (8602 minutes) - 0,52 goals/90 and 0,75 goals+assists/90
Mbappe: 40 goals and 26 assists in 59 matches (4650 minutes) - 0,77 goals/90 and 1,28 goals+assists/90
Do you really struggle to see anything that Mbappe is better at?
Sometimes nostalgia beats common sense.
Henry was a great player and he was maybe better at some things than Mbappe, but there's little doubt which of these two is the better player. Mbappe's been stuck in France for too long, but as soon as he moves on, he'll be cemented as the best or one of the 2-3 best players of this era.