IMO, a Rialto/Parker 88, is not worth the extra money, nib is the same one/identical to that both Vector and Parker 15, carry, only difference is that the Rialto/Parker 88 has a somehow more appealing 'overcoat', nothing else, besides the Rialto/P 88, with cap posted, is unbalanced (weight leaning to the back of the hand).
Parker 15 is known in the USA as Parker Jotter fountain pen. It is a good start pen too.
Nib on Parker 25 is totally different, being a very good (extremely rigid) short and semi tubular nib, I wish they still made it, - as well as the Parker 45.
Photos of semi tubular P 25 nib :
Photos of parker 15/aka Jotter (same nib as in the Vector, Beta made in India and other still currently being made Parker models, Parker IM and perhaps, perhaps Parker Urban:
All the best,
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