Both games on the 16 bit machines were great- they both had fantastic music and were a novel idea really. The first game was a little punishing and the levels were uneven, but good overall, Tides of time was an excellent game, it looked and played great.
The CD versions of the games were even improved beyond that, the first game even as far as I recall had better graphics, the graphics you got in the second cartridge version were closer to those enhanced graphics and the levels
were a little more varied but less "naturalistic" - and STORY was quite good for what it is. I know they were not everyones cup of tea but they were good.
Soundtracks though, SO good. Memorable for sure.
The Dreamcast game later ported to PS2 with some changes was a graphical showcase... they got a lot right but a lot wrong and didnt really bring ecco forward, also the weird story and odd narration made the game feel
much less epic and cool and just kind of strange and touchyfeely.... EXCELLENT work on the game, really - just didnt hit the "ecco" vibe for me or most others Ive ever discussed it with who were fans of the original games.
Ecco junior? No idea never played it. LOL. Game gear/SMS version I did bit but not enough to weigh in.