Originally Posted by
Hammer2016
I have both a Squale 1521 and a Doxa 300, one of the aqualung reissues. I love them both, having an individuality and personality that's pretty unique to them and with a vintage flavour that I really like. I'm not sure I could choose between them, to be honest. They both offer me something that I enjoy, so I think the only advice I could offer on that is put a picture of both on your desktop, and over a few days try to work out which one your eye is drawn to the most/you're getting least bored of!
I can't comment on the COSC aspect as my watch is from prior to that. I've not owned a Sinn, so can't compare them on quality.
Regarding Doxa customer service, previous to the Doxa 300, I had a 1500T (which I only moved on to allow the 300 purchase). It had a minor cosmetic issue on the bracelet. I contacted Doxa and they offered for me to send the whole watch in to have the clasp replaced, or to send out a replacement clasp to have fitted myself. I chose the latter as i tinker a bit and reckoned I could manage it (I couldn't! Didn't have the right tool fitting, but local watch repairer did and it was a quick swap). They also sent me out a Doxa cap with the replacement clasp, which I thought was nice of them, and still wear it when on the dive boat to this day. My impression of dealing with them was that they were helpful, friendly, and eager to address the issue in the way most convenient to me, so a very satisfactory experience. I remain a satisfied customer who regularly considers adding the new COSC 300 model to my collection, and probably will eventually. I think this issue cropped up around about 2015 to give you a time context on this.
I needed to get a replacement bezel for my Squale 1521 after a moment of abject stupidity. Squale's customer service was also helpful, friendly, and eager to get my issue sorted out, even though it was entirely my fault. Another positive experience here, so nothing to set them apart I'm afraid! Once again, I remain a very satisfied customer, and have since purchased one of their limited edition releases, which I also love.
All in all, I don't think you can go wrong with either unless you're unlucky, which can happen with any brand. They're robust, nice to look at and fun to wear, while being a little bit off the more beaten path of dive watches, and I've been happy with the quality level they offer for the price. In terms of time keeping, I've not had any issue with either.
I hope that's of help!