Wend123, I would definitely make a point of asking for Oestrogel because it is very easily absorbed and it is very easy to quickly adjust the dose up or down as required.
Like you, I had a Mirena coil pre-menopause and when I found out my oestrogen levels had dropped, I started using patches but they were not strong enough and I couldn't get anything like enough oestrogen out of them. The progesterone in the coil is strong and quite a lot of it gets into your overall system so you need a good dose of oestrogen to combat menopause symptoms.
I was told it is not a good idea to have a Mirena coil without adequate oestrogen because it can cause vaginal irritation and over thinning of the womb lining.
I had my coil removed but wish I had tried using it with Oestrogel before giving up on it because it think it would have worked better. Personally, I am far happier with gel than patches. I am now on the Oestrogel/Utrogestan regime.