The marlon's are pretty dang nice for the price. the tracks down the side make it easy to tie things down that aren't just sleds. I would say they are the best mix of well designed and reasonable cost.
The truckboss's are super nice, but like mentioned, if your someone that has to pull the deck multiple times a year for goosneck use etc then its not really a worthwhile setup.
Silverlake makes a nice deck, good explandable sides, nice well built ramp etc.
Jetstream, i've run one of these for multiple years, pretty no frills setup and incredible pricing. low 2k pricing for all aluminum and treated decking.
Regardless of brand, do an aluminum deck. There are plenty of people whipping up steel decks as anyone with a mig and a chopsaw can make one. They work but not really worth paying for, takes around a day to make one if its not powdercoated its going to rust sooner then later and with the cost of powdercoating alone you can get into some cheaper aluminum purchased models.
Quick thoughts on pricing, IMO once a deck exceeds 4k with accessories its time to consider a custom flatbed. There are numerous companies that make them (Silverlake T-rex Fab etc) I got a killer deal on a used one and its the best of every world. You can haul sleds and have goose neck hitch with no compromises or change over. I hauled our large gooseneck shop trailer to jackson hole this year. Park trailer in display spot, unload sleds out of the back, go riding, bring them back, hook up and head home when its all over. This is a pretty specific scenario, but a deck does have some limitations. Also the lower CG of flatbeds makes loading way less sketchy (around 16" lower then a deck) also it caries the sleds weight really nice, much less body roll when tearing down the highway. Overall just more useful more of the time.