Cassia Rose Heatley
Then it's proof that reading what a person says online does not make you know the person. I have above average athleticism and a better level of overall fitness than half of the people training in judo at my dojo. A little injury prone with my knees perhaps. Mentally perhaps a little too honest, competitive and emotional, though I think that would hurt progression in judo no more than in aikido - in fact competitiveness I believe is a good factor there.
Anyway, ultimately I would probably try both BJJ and Judo to see which felt better, both seem to fill the gaps where Aikido lacks. I have always enjoyed strength-based sports so grappling would likely be refreshing.
Sorry for the misunderstanding.
Anyway, trying both would be the best approach. Once you have first hand experience you can choose the one which better suits you as a complement to Aikido.