Actually, let's compare them :
SP. ATK: 110
This result is similar to Umbreon's, just having a better offensive.
- HP: Sylveon > Florges (95 > 70)
- ATK: Florges > Sylveon (70 > 60)
- DEF: Sylveon = Florges (65 = 65)
- Sp.ATK: Florges > Sylveon (120 > 110)
- Sp.DEF: Sylveon > Florges (130 > 120)
- Speed: Florges > Sylveon (80 > 65)
Sylveon is designed to have a better bulk, and unlike Florges, it doesn't lack an HP stat. Sylveon has a decent overall, with a very high Special Defense and a bad physical force. This implies its ability to run a special moveset but unlike Espeon, it will be bulky and very slow. 65 is not good for a competitive use. But Sylveon lacks a physically defensive position, this means "sortez les cotillons si vous avez Poison Jab contre Sylveon XD". In other words, you can begin a fiesta if you have Poison Jab Haxorus (although rare, for instance).
Florges is purely axed to compete with Volcarona, but unlike Volcarona, it doesn't suffer a Stealth Rock weakness. I see this flower in UU or OU with a Scarf. It has a decent speed, at least better than Sylveon. It lacks of a real HP stat, so Fake Out can inflict some damage, and then Iron Head for the win. Florges is able to use a calm mind set in its advantage if well predicted.
Say, for your actual team, I would choose Sylveon because you may need a bulky Pokemon beside Goodra. Now, if you plan a super sweepy team, go for Florges, although this would imply that your team will lack of a defensive Pokemon once Scarfchomp spammed Outrage on Charizard, Goodra and perhaps Heliolisk and Greninja. Beside Aegisalsh, you cannot battle Scarfchomp. And Sylveon, with that bulk, may have the ability to support your team with moves such as Toxic and Charm.
So the final choice is Sylveon.