A few months ago I asked a similar question on another forum and received so many answers. I quickly came to the conclusion there is not one particular holster people buy. Matter-of-fact, many posters wrote that they had a drawer filled with various holsters for the same pistol or revolver.
With that in mind, I read about various manufacturer's holsters. Since selecting a holster is a personal choice based upon many factors, I focussed on holster manufacturers that gave a 2-4 week trial period. If I didn't like the particular holster, I could return it during the trial period for a full refund. Though, I would have to pay for returned shipping.
I have had a Milt Sparks IWB holster for about 30 years for my P229 .40. The main thing I have not really like about it is the leather rough side is on the outside of the holster and it rubbed against me. Certainly, wearing a t-shirt under my dress shirt helped. I now carry the P229 in my briefcase.
So, I needed a holster for both an XDSC .40 and my bug P365. The first holster I tried was the Alien Gear Shapeshift Core Carry Pack. I ordered an extra shell for the P365 along with their pocket expansion pack
https://aliengearholsters.com/shapeshift-pocket-expansion-pack.html.html. Here is the link for your XDS 3.3 model
https://aliengearholsters.com/holsters/springfield-xds-3-3.html.
I was planning on trying a couple of other holster manufacturers, but after wearing the AG for a week, I knew it met my criteria. Their IWB is
so comfortable and I'm generally wearing it 14-15 hours every day. The same holds true with their pocket expansion pack. I wear the holsters regardless if I'm wearing dress clothes, a shirt with jeans, or a shirt and shorts. I like the fact that AG sells an extra belt clip pack that has "J" clips
https://aliengearholsters.com/toolless-holster-j-clip.html. They are much harder to detect and see. FWIW, I always scan belts and easily spot the normal clips manufacturers use when the person is wearing a tuckable holster with the shirt tucked in. Or when a person bends over and their shirt slides up exposing their belt. For my situation, I didn't want it to be so obvious....
BTW, my SIL actually has exactly the same system with the same calibers. He really likes them as well. In the end, what really matters is if the new holster will meet your criteria. So, try to select a manufacturer that has a good trial and return policy.
Good luck with your search!