I'd list Doyle as a legit #1 but as a receiving TE I think he is comparable to Witten, and I mean Witten now at this stage of his career. Solid hands, dependable, not scaring anyone.
Ebron has had some ugly drops during his career but had a good second half of the season and eliminated drop issue during that time, was actually wildly efficient the second half of the season. Two opinions floated around for him playing better in second half. One was that once the trade deadline passed he was more relaxed and the other theory was that the birth of his son matured him. Really not sure but I felt the focus should not be on fact he had a good 8 game stretch to end the season so much as why was he so bad the first 8 games to begin the season, that's the outlier in his career and not the finish to the season. If you look at his career, especially considering how young he was entering the league and transition he had to make his career progressed nicely and on the pace you'd like to see. Terrible confused looking rookie TE who was asked to do to much, growth in year two, more growth in year 3 and fantasy speaking a legit starting fantasy TE. Then he enters year 4 and the bottom falls out in first half of 2017 then despite being a part time player he would go on to close strong. So he went backwards first half of 2017, otherwise spent his Lions career steady progressing.
He had a bad camp last year. Can't recall injury, I think hamstring, but barely participated in camp. Add in he was in contract year, name brought up in trade rumors, whatever the reason he just flat tanked first half of last season but again other than that had been steady progressing. But the horrible optics on some of his bad drops and relative to where he was drafted and who he was drafted over a steady progression was not what people wanted to see and I think that along with his own immaturity made the situation in Detroit toxic for him and he badly wanted out. If there was ever a player who needed a change of scenery it's him.
Now that I've had a day to mull over his landing spot I'd label it as low floor/high ceiling for fantasy purposes but I'd for sure take him over Doyle all day every day. Colts are only team in history of league to have two TE's catch 8 TD's in same season but to me NE is only team to ever have two viable starting fantasy TE's on same team at the same time. That could happen here but nothing I'd be counting on. Ebron is the one I'd invest.