I thought the first two, maybe three, single Turtles discs looked about as good as they could. I'm not sure what format the masters exist on in the first place, but I don't think daily cartoon shows from that era will ever look stunning. The subsequent volumes and season sets did take a tumble, but reviews I've read seem to indicate the more recent sets look better.
Anyway, I think Lionsgate is preferrable over HIT in this case. What HIT did was unforgivable. There might be as many people kicking themselves now as there were a year ago.