Metal roofing is the most significant plus with its durability. Shingles need regular replacement and if just one shingle gets damaged, that could equal immediate water damage. The strength of an asphalt shingle also leaves much to be desired. You can also get professional metal roofing in London.
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If you want an alternative that does not use tar and asphalt, metal roofing is a green roof alternative. The fabrication of metal sheeting certainly has its environmental effects, but those effects are minuscule compared to using asphalt. Asphalt is basically just oil residue, but it does not last very long.
The amount of maintenance required of metal roofing makes it much cheaper over time. Correctly constructed, metal roofing should be like a shield, protecting your home for years. Most homeowners do not replace their roof or realize there is a problem until there is a leak causing damage in the home.
With replaceable shingles, this means possible roof damage every few years, instead of every half-decade with a metal roof. Asphalt roofing is becoming obsolete because there are so many roofing materials now that do the job better, with less labor required.
Asphalt is still the cheapest, but as a property owner, you should be looking at the house as an investment. Over time asphalt will require many repairs and it will not increase the value of the house like metal roofing can.