Need Help In Identifying Whether Problem Is In Router Or ISP.

Traceroute from one modem+router :

traceroute to www.google.com (74.125.236.147), 30 hops max, 60 byte packets
1  192.168.1.1 (192.168.1.1)  1.126 ms  1.572 ms  1.999 ms
2  117.196.96.1 (117.196.96.1)  49.049 ms  51.824 ms  53.268 ms
3  218.248.165.102 (218.248.165.102)  57.507 ms  60.394 ms  60.638 ms
4  * * 218.248.235.197 (218.248.235.197)  79.159 ms
5  * * *
6  74.125.48.138 (74.125.48.138)  88.983 ms  53.666 ms  55.359 ms
7  72.14.232.202 (72.14.232.202)  59.891 ms  61.117 ms  63.935 ms
8  216.239.48.179 (216.239.48.179)  68.211 ms  69.807 ms  71.263 ms
9  bom03s02-in-f19.1e100.net (74.125.236.147)  74.453 ms  76.907 ms  79.832 ms

Traceroute from another modem+router :

traceroute to www.google.com (173.194.36.116), 30 hops max, 60 byte packets
1  192.168.1.1 (192.168.1.1)  0.961 ms  1.531 ms  2.068 ms
2  * * *
3  218.248.165.106 (218.248.165.106)  52.059 ms  55.923 ms  58.672 ms
4  * * *
5  * * *
6  74.125.48.138 (74.125.48.138)  86.051 ms  48.639 ms  51.591 ms
7  72.14.232.202 (72.14.232.202)  55.168 ms  57.106 ms  62.332 ms
8  * 209.85.252.142 (209.85.252.142)  125.293 ms *
9  66.249.94.245 (66.249.94.245)  95.641 ms 209.85.252.142 (209.85.252.142)  86.536 ms 209.85.240.17 (209.85.240.17)  86.225 ms
10  * * 209.85.240.17 (209.85.240.17)  86.731 ms
11  * * *
12  * * *
13  * * *
14  * * *
15  * * *
16  * * *
17  * * *
18  * * *
19  * * *
20  * * *
21  * * *
22  * * *
23  * * *
24  * * *
25  * * *
26  * * *
27  * * *
28  * * *
29  * * *
30  * * *

I am unable to understand anything from traceroute as I am ignorant in this networking crap.
Can anyone tell me what is difference between result of traceroute of router1 & router2 ?
This problem of internet speed spikes is prevailing since last 10 days, even BSNL technical person is unable to iterate it. So, I would like to know whether it is ISP problem or my router is screwed.