CPU Test: The G4 has a better Altivec than the G5, so thats why you have a better score there. But the G5's improved FP Unit makes short work of the older G4's.
Memory: The 1GHz bus and DDR400 (PC 3200) dual channel RAM speaks for itself on this one. Pretty much handed your G4 its ass on a plate in all but the allocate section (a fluke if you ask me, but I remember first testing the G5 when it had been introduced and seeing the same thing.)
The person with the G5 didnt run the graphics test (which he probably would have run.. the Geforce FX 5200 ultra is more powerful than your Radeon 9200 mobility) and you didnt run the disk test (which he also would have won: 7200RPM SATA drive can easily beat a 4200RPM PATA drive.)
So all in all, pretty good scores... but no G5.
[edit:]
I Ran xbench too, to see how I did:
Results 107.37
System Info
Xbench Version 1.1.3
System Version 10.3.5 (7M34)
Physical RAM 1024 MB
Model PowerMac3,5
Processor PowerPC G4 @ 934 MHz
Version 7455 (Apollo) v2.1
L1 Cache 32K (instruction), 32K (data)
L2 Cache 256K @ 934 MHz
L3 Cache 2048K @ 234 MHz
Bus Frequency 134 MHz
Video Card GeForce4 Ti 4600
Drive Type IBM-IC35L060AVER07-0
CPU Test 111.28
GCD Loop 104.69 4.09 Mops/sec
Floating Point Basic 113.37 409.97 Mflop/sec
AltiVec Basic 114.09 3.31 Gflop/sec
vecLib FFT 117.52 1.82 Gflop/sec
Floating Point Library 107.70 4.31 Mops/sec
Thread Test 80.01
Computation 57.51 776.42 Kops/sec, 4 threads
Lock Contention 131.40 1.65 Mlocks/sec, 4 threads
Memory Test 122.95
System 168.95
Allocate 593.96 387.44 Kalloc/sec
Fill 180.86 1439.62 MB/sec
Copy 94.85 474.23 MB/sec
Stream 96.64
Copy 93.88 686.30 MB/sec [altivec]
Scale 96.25 710.35 MB/sec [altivec]
Add 96.08 614.92 MB/sec [altivec]
Triad 100.56 614.42 MB/sec [altivec]
Quartz Graphics Test 137.29
Line 129.85 3.31 Klines/sec [50% alpha]
Rectangle 122.59 8.62 Krects/sec [50% alpha]
Circle 141.57 3.26 Kcircles/sec [50% alpha]
Bezier 127.06 1.38 Kbeziers/sec [50% alpha]
Text 177.76 2.90 Kchars/sec
OpenGL Graphics Test 99.27
Spinning Squares 99.27 69.47 frames/sec
User Interface Test 206.55
Elements 206.55 66.44 refresh/sec
Disk Test 74.75
Sequential 74.50
Uncached Write 64.99 27.09 MB/sec [4K blocks]
Uncached Write 63.90 26.17 MB/sec [256K blocks]
Uncached Read 149.34 23.64 MB/sec [4K blocks]
Uncached Read 62.65 25.31 MB/sec [256K blocks]
Random 75.00
Uncached Write 61.01 0.92 MB/sec [4K blocks]
Uncached Write 72.08 16.26 MB/sec [256K blocks]
Uncached Read 96.60 0.64 MB/sec [4K blocks]
Uncached Read 78.60 16.18 MB/sec [256K blocks]
