I started with a Merkur VISION 2000, not a good experience, did not understand what I was doing and expected excellent results out of the box. Did not realise that DE shaving is about steady reduction - multiple passes.
Went to a Murker 34c, watched a lot of YouTube DE tutorials and spent more time on good prep - started to get better results. Once I was confident that I could get good results, consistently, I then decided to experiment more.
I am lucky, as I can get to Dundee quickly and Ian at the Gentleman's Groom Room is excellent. In terms of choosing a razor talking with an expert and getting the chance to see razors and to hold these helps.
Now when I choose a new razor, I look towards reviews from posters here (as well as regular trips to the Groom Room) and then start to do more reseach. I do have a preference for a razor that sits between mild and aggressive. Looking at the comments here helps me guage how a razor performs and I appreciate that YMMV. I am also more interested in the quality and look of the razor - although performance is the first criteria. It is amazing looking at the shave of the day to see different set-ups and razors. Often this wet my appetite to add to my rotation. Last autumn Ian was all excited with the Muhle Rocca - when I got the chance to see the Rocca, it was a must buy and I had no doubts. Most recently from comments here, I went for the Hone starting with the 15a and then also going for the 15.
My advice for a next razor - think about what you want from a shave and what floats your boat, explore the options and then go for it, whatever it may be.
All the best,
Chris