Back in my early days of Aikido, a friend called it "old man's judo" and I felt initially insulted. But one of my initial reasons for studying Aikido was to keep getting better as I got older, and so I realised that this was (perhaps) a compliment.
I also had a teacher in Holland for 6 months who had 15 years judo, and then 10 years aikido - and he was damn good.
Since then, have come across dan ranked judoka who feel very stiff in aikido. Also those who feel very powerful and yet soft. Also those who enjoy my aikido classes and find it is something different to what they get in judo.
Get out there and make your own mind up