What caliber and how much?
I've had both, still have the Lyman.
Both shot well enough, the Lyman a bit better than the T/C.
The T/C was a .54 and shot the Maxi ball well, but the 21" barrel was LOUD.
The Lyman's 24" is gives a little better sight radius, it's a 50 and shoots a wide range of bullets and sabot/bullets very well.
With charges under 70 grains the D.S. .50 shoots the r/ball quite well.
Tough choice as they are about the same.
If $$$ is an issue and the Lyman can be had significantly less than the T/C I'd go Lyman.
I got mine last year unfired for 140 bucks.
If interested I have a .50 T/C mossy oak 21" in about as new shape for 175 bucks + 20 bucks shipping.
It too was unfired and I tossed a couple rounds downrange wiith it.
It's mossy oak all over so don't lay it down in the woods as you'll never see it again. :-D
I don't want the mossy as I have a ton of rifles and use my custom flinters now. :-)