...I reckon cost would be a significant factor...
Here's the superbly comfortable (cheapest and great-sounding) tan omni that I use (up to eight at a time, for spoken-word presentations, conferences and rugby referees) with my Line 6 TA4-socketed (V70) beltpacks.
As for tan directionals that will succesfully work with Line 6 beltpacks, just about the only directional available in beige or tan is the fabulous Countryman E6, at roughly double the Samson's price:
I'd refer you to Dan Cornett's excellent Line 6 support document on this subject that, ...although originated in respect of V70's, ...applies to other Line 6's TA4F equipped beltpacks:
Isn't it a shame that cash seems to be a major requirement for so many solutions? ( !)
They sound very similar.
I can't imagine anyone rejecting either of these omnis in favour of the other on the basis of the audio quality from their capsules alone,
...however, and it's a very big HOWEVER...
When it comes to wearer comfort, "acrobatic" performance and total freedom from frame or cable-induced mechanical noise, the SE50 is in an entirely different league.
In my experience, (click on my pink pic at left for details) Samson's uniquely flexible, behind the ear "archer's bowstring" method of securing the SE50's is absolutely without peer in terms of the above three parameters, with true "forget I'm wearing it" comfort and matchless ease and versatility of fitting.
One of my rugby referees emerged from under a pile of twisted bodies, having been accidentally "buried" beneath a rolling maul, with his (fully functioning) mic still in place. (As for his ego, ...aah, well...)
As with their Countryman, DPA and Rode competitors, the tan versions are quite inconspicuous "on camera", with the Samson's not only being roughly half the price of the others, but also far more rugged and readily adaptable.
I'll just append my usual disclaimer, with a view to assisting your evaluation:
I have neither affiliation with, nor particular loyalty to, Line 6, Samson or Sweetwater Sound.
I hope this helps.
Great detective work, Sherlock Sheriton !
Turns out it's buried in this Line 6 Brochure http://line6.com/media/xdv/Wireless_Mic_Brochure_EN.pdf which reveals its Line 6 part number to be 98-033-0030.
I wonder if Thomann's is old stock from a now discontinued line, their price from the above link being pretty much the same as Samson's SE50,
whereas Line 6's black HS70 (part number 98-033-028) is generally available for around (US) $60 less.
It won't surprise anyone that (given my ownership of twelve, four permanently configured for rugged outdoor use such as rugby, having double "foamy" windgags glued on with silicon sealant) I prefer the Samson SE50's.
If, however, the HS70T (tan) was available at the "black price", certain applications and budgetary considerations may well outweigh that preference.