Hi. Take a look at the UKIPO website for some great free advice on trademarks.
Your trademark is your brand so you want to protect the version your customers will come to know and love.
You can only use the registered r symbol against the exact image/word that you have filed so best to register it how you are going to use it.
Please feel free to pm me if you want to chat it over.
Best policy is to register both if you the budget.