Hi, congratulations on the birth of your baby. You do what feels best and works best for you. Establishing breastfeeding is very hard work. Out of the two options you mention I have experience both.
DD1: expressed and bottle fed exclusively for six months. This had the advantage that I had more freedom to go out if I want, but I was tied to at least 8 lots of sterilising bottles every day. It's very time consuming. Not an easy option at all.
DD2: bf for 9.5 months. Great as on tap, however all the night wakings were my responsibility as I was the only one to be able to feed her. I should have got her to be able to take a bottle, maybe should have done one bottle of expressed milk a day. Unfortunately I did it too late (I've heard to start when they are a few weeks old, but no more).
DD3 still feeding her she turned 2 a couple of weeks ago. Did not manage to get her to take a bottle either, this was a mistake.
If you carry on breastfeeding, it is hard, by no means an easy option. However, there is never a stress about having enough milk, or having to clean bottles. Do what you need to get through the first few weeks, lansinoh is your friend. I gave many bottles at the start to all of my children and not just breast milk. This was to give my nipples a rest (I always expressed for every feed given like this though, to mimic demand)., and also to survive thrush.
Good luck, as I said before its up to you how you feed, do what is best for you and your family.