When traveling through England and Ireland is it best to rent a car or use public transportation?

I am traveling to England and Ireland this summer and have looked into several different options. I've looked into renting a car or just using public transportation (i.e. the railways and buses). It will be my first time in Europe and I want to see as much as possible! I plan on spending time in Dublin,... show more I am traveling to England and Ireland this summer and have looked into several different options. I've looked into renting a car or just using public transportation (i.e. the railways and buses). It will be my first time in Europe and I want to see as much as possible! I plan on spending time in Dublin, Manchester, London and surrounding areas. How should I travel?
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