When you are talking a high-end detector, the deciding factors can often be subtle as they all offer performance and features that fit certain niches or applications just a little better than the compeition . . . . across the board, not sure the perfect all around detector has been built yet.
As far as your points . . . . . .
WEIGHT & BALANCE
The weight (or lack of it) and balance of the Deus is legendary and hunting with it from sun up to sun down has been one of the areas where users rave. Even with the control unit mounted on the shaft, it weighs just 2.2 pounds. The larger coil does throw the balance off a bit but the adapter piece from the UK solves that issue niceley.
The CTX 3030 is clearly better balanced than the Explorer and E-Trac FBS models but it does weigh 5.3 pounds with the stock coil. There's a saying that goes "
What weighs more, 1 pound of lead or 1 pound of feathers?" and the answer is they both weigh the same. At the end of the day, you will still have been carrying around a 5.3 pound detector which may feel lighter than the E-Trac but is still heavier than the Deus.
IMPORTANCE OF SPECIFIC FEATURES
Look at the features both detectors have and make a list of them. Put a check next to those that you feel will be important and an X next to those that won't. Some may be "gimmicks" that will really not help you find more in the ground so leave them off the list unless you feel you really want them.
You mentioned that the water resistant feature on the CTX 3030 was not really important to you now but remember, the Deus is waterproof as well - by slipping the control unit in an iPod water case ($50 or less) and an antenna wire, you can actually do well shallow water hunting with the detector. It also allows one to hunt in the rain without fear of damaging the unit. I put the case in my pack when I go relic hunting so that if a storm comes up and I am a mile from the truck, I can keep hunting.
Without having extensive time with the CTX 3030 in iron infested sites, I can't comment on how the screen trails / trace function aids one in locating targets in close proximity to iron but not sure how many hunters want to search staring at the screen when they get into high trash. The E-Trac and Explorer do fine in these areas with 1) a smaller coil and 2) slowing way down to hear signals being hidden in the trash. If you go to the Explorer forum and look at some of the posts from Bryce Brown, you will see what one can and does find in iron with one of these FBS detectors.
I can say that I have extremely impressed with the Deus in iron and that has been echoed by users here as well as overseas for years. Before I can really render an opinion on any detector I like to have 50+ hours on the unit in a wide range of sites and using the Deus for many months I can give you that impression. But I have found a great many relics and coins with both my Explorer and E-Trac in sites most hunters ignore completely. Don't write off getting one of the other FBS detectors (and of course a copy of my book

) as they are by far not obselete and will still serve you well as well as having a wide range of coils and options readily available.
Forums are a great source of information but they are not gospels . . . . . weigh the information you obtain and use that as a factor in making your purcase decision. A detector that may be the "best thing ever built" in say Dallas, Texas might not serve your needs searching the fields in Denmark. Also consider how much run-time is out there yet . . . the CTX 3030 has generated a great deal of interest and buzz on the forums but it has only been in the hands of actual customers that had to pay for the unit themselves for a week or so now (released to the public on May 28th) . . . . unless you are in a rush to get one or the other, why not wait to see what the tone is a month from now. Is there a chance of trying either yourself first?
You may also want to post a question on the CTX 3030 forum asking specifically how it works in the areas you are searching and ask for details not just "it should be great for you" . . . has anyone used it in your application. Time in the field will be the true test of any new detector - posts from testers simply shows how it was used in a limited number of sites and as experienced hunters know, a site 50 miles away can be totally diferent in terms of how a detector performs.
Hope this helps
Andy Sabisch