If you think you need to push the boat off your trailer into very shallow water and winch the boat back on to the trailer, then a tilting roller trailer would be best - but other than that I'd stick to bunks.
Personally, I'm not a fan of roller trailers. I have had a couple. My used R1655TN came with a misfitted roller trailer and I replaced it with a drive-on bunk trailer asap. I also ordered a roller under a Lund Deep V (mistake) many years ago that was a pain to load - especially since I was used to bass boats with custom made drive-on trailers.
Some salt guys don't want to get their hubs wet (I kid you not) and like to use roller trailers to crank their boats all the way on, but I think that is the exception to the rule these days,
Bunk trailers used to be a bit sticky and made loading heavy boats tough sometimes, so many large boats used rollers. But with the new bunk slides, they are nearly as 'friction-free' as a roller trailer.
I had some slides put on my bunk trailer for my large boat (~5000 lbs wet, w/o trailer) and I was amazed how slippery it was. Push off, drive on, no problem. (PS: I call the big boat my wife's boat. She deserved picking one out after putting up with 25 years of fishing boats
BTW... People should know of they have a drive-on trailer or not. Drives me nuts to see someone with a drive-on trailer take 20 mins to float/pull/push a boat onto a drive-on trailer. I saw someone do this at a local lake over the weekend. Pulled in way too deep, wound up pulling out with his boat sitting on top of a severely bent guide-on. I tried to offer some advice but the poor guy was too flustered...
Anyway, for tin boats, I think bunks are the only way to go - unless you REALLY need to push off into a puddle.