Noise source vs tracking generator for frequency response measurement

So I want to buy a spectrum analyzer and I'm going to measure frequency responses up to 150 MHz with it. However, there's an odd situation: analyzer with a tracking generator costs S2500 and the analyzer without one costs S500 and I'm trying to figure out what would be a better option, buying an analyzer with a tracking gen or building a noise source with a zener and a few MMIC amplifiers. Are there any additional challenges and pitfalls with measuring frequency responses using a noise source?

Dynamic range respectively accuracy will be considerably lower. Can be partly compensated by extended measurement time. May be o.k. for some applications.

Will it be sufficient for narrow band filter/amplifier tuning?

A VNA USB box is probably the better solution, you get 1 MHz to 3 GHz VNA < 500S. Or a used benchtop VNA.

Oh, how could I forget about those. Thanks a lot!

For this frequency range, I like the VNWA3. It offers more advanced port calibration than many other entry level VNA.

https://www.sdr-kits.net/introducing-DG8SAQ-VNWA3