Hi ladies everyone is different but for me I like the clear blue digi. They seem to have always worked fine for me and even my last pregnancy the weeks weren't working out but then as the pregnancy progressed and I even saw a hb on ultrasound, baby measured considerable behind and I went on to mc so I even think from the beginning the CB digi was telling me something was wrong.
I'm a little a head of you this time, currently 10+3, have my 12 week scan on 13th jan and I have been able to pick up hb on Doppler since 9+5 which is great reassurance, you don't have to wait until 12+ weeks for that.
I'm also in the uk and because I had a mc in September I was able to have an early scan on the nhs at 7+1 which showed everything this time is good so far so you don't always have to pay private you could try for an early one as well by talking to midwife.
Hope I've helped a little