I have 5 battery tenders all juniors because for our cars there is no need to use a full size one. I have them on generators, my Ford Super Duty with 2 Optima batteries and all 3 of my BMWs. I now have only 2 BMWs and a new Outback and 2 generators but I use them all.
In 10 years I have never had one issue with any of them and they continue to provide great service.
My 335 battery is now 5 years 10 months and my M3/4 battery is closing in on 9 years. I think the only reason they last that long is because I religiously use them when I am not using one of the vehicles.
I think the CTEK is first rate also so either works. I got my juniors for something like 25 bucks free shipping from Amazon...