It is a common question for anyone investigating green roof systems. Both types of green roof have pros and cons…so which one should you choose?
Many factors should be considered when installing a green roof system
Main
tenance Both sedum and wildflower (Bio diverse) roofs require maintenance. However a wildflower roof will require much more maintenance due to their large variety of plants and the types of plants used. Whereas sedum are very low maintenance and rather hardy. Wildflower roofs require more feeding, irrigation and are more labour intensive.
Appearance Sedum is a hard wearing and draught tolerant plant which offers colour all year round. Sedum is aesthetically pleasing, as is wildflower roofs. Wildflower roofs offer a more varied mix of plant species and local wildflower plants can be incorporated into a wildflower green roof to be in keeping with the surroundings.
Weight Wildflower roofs require a deeper substrate to hold more nutrients. Whereas sedum is very versatile in extreme weathers and can survive easier in shallow substrate. Therefore when installing a wildflower roof , the roof weight limit must be considered to make sure the roof will uphold the system 
when fully saturated. A green roof with a weight of 30kilo per m2 generally consists of just sedum whilst a wildflower / bio diverse roof can weigh upto 220 kilo per m2.
Wildlife and habitats Both sedum and wildflower roofs provide much need habitats and food sources for wildlife and insects. However wildflower roofs can attract a wider variety of wildlife including bees.
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