I have herniated disk, either I have surgical operation or physiotherapy, which is best?

Hello.
My name is (…)and my problem is that I cannot walk more than 5 minutes. After 5 I feel difficult in walking and feel pain in my leg.I went to the doctor he said that you have herniated disk lwk4/5 problem.this is the doctor reports.
(The presentation took place with the detection of high-grade spinal canal stenosis
LWK 4/5 intervertebral disc disease.
Anamnestically, the patient states, for several months under a pronounced
Claudicatio spinalis – Symptomatik to suffer. He could not walk more than 4-5 minutes
And then had to stop, because the pain lumbar with radiance in the
Dermatom L 5 left almost unbearable.
In this MRT of the LWS of 28.06.2016 is a large intervertebral disk incident LWK
4/5 with narrowing of the spinal canal, as well as an additional spinal canal stenosis
In this area, which lead to a massive compression of the nerve fibers.
With the patient was detailed about the possible conservative and operational
Therapy possibilities. We recommend a sequestrectomy, as well as a lumbar
Decompression in this area.)
The doctor said that you have two option one is surgical operation and the second is physiotherapy. But the surgical operation is risky. Now I don’t know what I do.and what is better for me.please give me usefull advise.
Thanks