The "Traumahawk" has a bit of a reputation as a not ideal trainer. I haven't flown one myself, so this is all hearsay. But it could with its T-tail sometimes get in to stalls and subsequent spins that were not easy to get out of. The T-tail, in all designs, has a tendency to get blanketed by the main wing in high AOA situations, which can make the elevator less responsive.
The C152 is a workhorse. It's cramped, but it flies really nicely. Light on the controls - just one big pussycat. You can really mishandle it and it will never bite you. Stalls are a non event and you have to induce wing drop on most of them. Visibility in turns is not as good as the Tomahawk, but then you do see the ground. Swings and roundabouts.
Not having flown the Tomahawk it's unfair of me to compare, but I personally think the 152 is a lovely aircraft to fly. You can't go wrong with it.