Mangrove Road is a very sought after desirable road, in the "right part of town"
Foxholes is just a legoland of bog standard new houses on the edge of the Town.
Pretty much this, it's also too far for me to walk into town on a regular basis, when we moved to Hertford, 10 years ago now, we excluded Foxholes for that reason, coming from London we were used to walking to places. Not stuck in an estate on the edge of town. Not sure how bothered other people of Hertford are about this but it was a major consideration for us.
Also wrt property prices, sold prices on Zoopla
SG14 - 5 Year Change - +18.9%
SG13 - 5 Year Change - +19.05%
SG14 - 1 Year change - +6.98%
SG13 - 1 Year Change - +8.05%