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The P series and the L series are two very different beasts. I think you mean the P*s and the T series.
The “real” P series are the P16 full fat cost is no object workstation, and the P1 is the MacBook. There’s the P14/16s models which are just T series machines with a Quadro GPUs instead of regular GeForce models. (They may have discontinued the dGPUs in the T series I’m not sure)
That said I can’t speak for the quality of the modern E or L series. I know older ones are garbage compared to thinkpads, but good compare to normal consumer grade sludge.