Sorry, little late to the party. I use both the easy dens and a tilt for each of my ssbrewtech fermenters.
The tilts can read through the fermenter, just have to be within about 6 ft or so. I one day plan to do a raspberry pi setup so the data can go straight to brewfather.
Everytime I pull the tilt after kegging it's fairly caked in yeast and hop material, how much it's impacting the results I'm unsure of. The thing with the tilt is it is best used as a tool to track how fermentation is going, i don't let it give me my final reading. For example I use it to know when to start my diacytel rest and to know when fermentation is complete, but I always confirm final readings with the easy dens.
As for the easy dens, I think it's worth the price. I love the small sample size, it auto adjusts for temperature between 86 and 41 f I believe (although I've ran it with samples at 140 and it read the same). Because the sample is so small it's very quick to cool them to appropriate temp in fridge or freezer. Super easy to clean, just flush it with warm distilled water.
Ultimately, it really comes down to personal preference and what you are willing to spend. I also love knowing I have a device I can truly trust and calibrate my tilts to as well. Most my other hydrometers have small differences in readings and I never knew which one was actually correct. You can easily calibrate the easy dens with distilled water too. Anyways, short story long, I love it. Hope this helps.