Agilent 34450 has one more digit of resolution and better accuracy (0,015% vs 0.025% DCV, 0,2% vs 0.4% ACV), 4-Wire resistance measurement etc..
Spec wise, it is definitely better specced multimeter.. But they are different types of multimeter. Agilent is entry level lab type and Fluke is top of the line handheld for field use..
They are meant for slightly different use, and are made for that..
If you think Fluke precision is good enough (it probably is, if you don't have specific need for specific precision) and you like it and use it all the time, then maybe you really don't need Agilent..
Sell it for good price, and use money to buy something else you will use...
I personally would sell the Fluke and buy cheaper handheld DMM for general troubleshooting and have a really precise one for times when I need it.. But that is me and the way I think and work..
You need to do what works for you.
Regards