Well I'm not a big fan of obese breasts, for example
But I'm not too fussed about size
Large perky ones are best to look at
Small perky ones are the best to handle IMHO
Boobs are like puppies (hence the nickname "sweater puppies"). They are warm, soft, cute & cuddly, always receptive to kisses, smallies require more tender care and cupping with warm palm of hand. Chonky puppers are more likely to hurt you whilst playing and are more at home running free in open environment.
But I'm not too fussed about size
Large perky ones are best to look at
Small perky ones are the best to handle IMHO