Should I change the Wheels

I am looking at The Giant Defy and the Specialised Roubais. This follows several weeks of research but I do not know what to do about the wheels.
I am currently 16.5 Stones in weight and when I was looking round several shops I visited sugested that with my weight I should upgrade the wheels, is that really necessary?
Osprey
I am currently 16.5 Stones in weight and when I was looking round several shops I visited sugested that with my weight I should upgrade the wheels, is that really necessary?
Osprey
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If I could I would get a pair of 32 or 36 hole handbuilts but I weigh 19.5 stone so my issues are more acute than yours.
Trek Madone with Bontrager Race Lite X wheels and never had any issues. Now 14 stone and just renewed bike to a 2012 Madone 5.9 with Shimano Ultegra wheelset. Six weeks in and rear wheel needed truing. Apparently that's quite normal I was informed with a new bike.
So give it a go and just be prepared to have the wheels trued at the bikes first (usually free) service.
You may get different advice too from those more experienced on bicycle mechanics and engineering than myself as I can only speak from experience
Kinesis Crosslight T4
As previously said, I'd stick with the stock wheels to start with. See if they need truing at the first service. And then take it from there.
Handsome Dog framed MTB
Which upgrade are they suggesting? These days most bikes come with fairly censored wheels, so if the upgrade is sensible and does not break the bank, it might make sense...
2012 Bianchi Infinito