Very very sorry to hear this.
I've had three MCs, first was MMC and I opted for ERPC. I went on to have two natural ones.
For me, the ERPC got it over and done with. I couldn't bear the thought of the baby still being inside me (sorry if too blunt) and I just wanted the whole horrible situation to be over and done with so I could start getting on with things. But that was just me.
The staff were really nice, the procedure was quick (although the waiting around all day in hospital beforehand was very boring and miserable - I was lucky as I had DH with me the whole time). I felt fine afterwards, just very tired.
The downside was lots of bleeding for a few days afterwards (make sure bring pads to the hospital as the ones they give you are rubbish). There is also always a risk with general anaesthetic of course.
The other downside was being asked if I was prepared to donate the foetus to research after the ERPC. I lost it when they asked me, so be prepared if they ask you. It was a total shock and I nearly slapped the nurse in the face.
The upside was once it was done, it was done and I did feel I could just heal. It takes a while, but you will feel better eventually. Give yourself time to mourn, but then in my view it's time to pull yourself up by the bootstraps and have another try. It's easy to dwell, but for me I had to nip that in the bud and look towards the future.
Comparing it to the two natural ones - they HURT! And they were scary because the whole thing was more violent than I expected. Like a really really horrendous period with awful cramps.
TMI and some harsh realities coming so stop reading if this will upset you... but it was the reality of the natural ones for me if you want to read about it to inform your choice.
The worst worst part of the natural one was having to check that I'd passed the embryo. This is not pleasant but I was told it is necessary as I think you're supposed to keep track so they know whether there's anything retained.
The other worst part was having to decide what to do with it when you do pass it. Again, I know this is awful to hear, but it's what will happen and it's better to be prepared in my view. I know some people keep it and bury it. It doesn't look like a baby, just a round fleshy ball (although I didn't look too closely - I was 7 weeks for both). But you'll know what it is and it will be extremely upsetting.
To end on some good news - my body healed, and now I'm 26 weeks with a healthy little boy and feel much much better. It took a lot of time and it was very miserable at times, but you know you can get pregnant, so look to the future and try to focus on this fact. That's what helped me.
Good luck and whatever you do, choose what's best for you and let yourself feel what you need to feel.