Unless you get yourself a kit from Trumpeter from say more than 10yrs ago...then anything you get from Trumpeter is going to be better than the ARK kits.
For the most part they are just reboxes of kits from other defunct Eastern European companies like Eastern Express, Alanger, Maquette, etc, etc.
If you can get them cheap enough, they might be a good deal, but I wouldn't recommend them as something for your first armor kit.
Trumpeter stuff is good, some of it is great. Don't know as if I would recommend them as a first armor kit either, but only because they tend to over engineer some of their assemblies. Where as Tamiya might make a part in 1 or 2 pieces, Trumpeter would do the same part in 5 or 6 pieces. Doesn't make it any easier or harder to put together, just more time consuming. Of course in that 5 or 6 pieces, you will usually end up with something alot more detailed than the same thing made out of 1-2 pieces.
Some Trumpeter kits will take awhile to build, while others you can build in a weekend. The BTR 50 I am working on....pretty much built the whole vehicle minus the tracks in a weekend. Of course going to take longer to paint and finish, but the kit was assembled in about 2 days, and not a drop of putty on it anywhere, it fits that well.