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How much better is a 1/2 wave antenna to a 1/4 wave antenna?

I have a 9dbi "rubby ducky" antenna and am thinking about replacing it with a 8.5dbi omni antenna found here http://www.data-alliance.net/-strse-142/Antenna-8.5dBi-omni-Wireless/Detail.bok
Because the 2nd antenna is 1/2 wave am I going to notice a performance/range increase?

The 1/4 wave antenna is superior. Half wave antennas do not radiate well because of the lobe location. 5/8 wave vertical antennas radiate well and have a higher field angle. The 1/4 wave has a low field angle. If you want to communicate through a mountain-top repeater, the 5/8 wave is the best. If you want to communicate horizontally close to the ground, like from car to car, the 1/4 wave wins.

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6 Lot Right-Angle 90 Degree SMA Male to Female Adapter for Ham Radio Gold Plated    US $17.95

SMA-TS9 adapter RP SMA female to TS9 male Straight hot!!!    US $.50

1pcs RF Connector Adapter T type right angle RP-SMA male to RP-SMA female    US $.99

1pcs RF Connector Adapter SMA male to RP-SMA female    US $.99

T Type Three Female SMA Adapter 10pcs EOL    US $8.59

SMA-Female Dual Band Antenna For PX-333/PX-777/TK-3107/KG-669/KG-UVD1P/TG-UV2    US $.99

BNC Antenna Adapter for Motorola Radios SMA Female to BNC    US $9.95

SMA Jack female to SMA Jack female bulkhead o-ring straight    US $.99

Female SMA Plug Coax Connector Adapter Gold Tone New    US $2.27

Female SMA Plug Coax Connector Adapter Gold Tone New    US $2.16

5pcs Double-Window SMA Female Nut Bulkhead Crimp RG174 RG316 LMR100 RF Connector    US $5.03

5pcs Small Hole SMA Female Jack Center Nut Bulkhead Crimp RG174 RG316 LMR100 RF    US $3.99

3mm Antenna Interface SMA Female Straight RF Connectors    US $4.79

5 Pcs SMA Female Plug Center Solder PCB Mount RF Connector    US $8.71

2pcs SMA female jack To RP-SMA plug female pin RF Straight connector Adapter    US $3.30

T Type Three Female SMA Connector for Coaxial Cable    US $2.27

10pcs T Type Three Female SMA Connector for Coaxial Cable    US $5.47

5pcs End Launch PCB Mount Bulkhead SMA Female RF Coaxial Connector Straight    US $5.55

UHF SO-239 SO239 Female to SMA Male Plug RF Connector Adapter    US $4.91

SMA Female Straight RF Connector for Antenna Interface    US $3.99

UHF SO-239 SO239 Female to SMA Male Plug RF Connector Adapter    US $5.06

SMA Female To Female Jack Straight RF Coaxial Connector    US $1.40

Male to Dual Female SMA Coaxial Connector T Adapter    US $2.27

15x SMA 2 hole panel female solder Post terminal Medium    US $23.00

End Launch PCB Mount SMA Female Plug Straight connector Adapter 5pcs    US $5.03

Threaded N Male to SMA Female Jack Adapter Connector    US $4.66

1120 MHz PLL brick oscillator, SMA female output    US $24.00

SMA Female Straight RF Connector for Antenna Interface    US $3.99

15X SMA female PCB Mount wide flange .031'RF connector    US $23.50

SMA Female to Two SMA Female Triple T RF Adapter connector 3 way Splitter    US $2.16

Digital Communication RP-SMA Female PCB RF Coaxial Connectors    US $6.30

100pcs RP-SMA thru hole female RA PCB Mount with solder post RF connector    US $89.00

SMA Female to SMA Female Jack in series RF Coaxial Adapter Connector    US $1.40

N Male Plug to SMA Female Jack Straight Adapter Connector    US $4.96

RP-SMA female to CRC9 male Huawei USB Modem cable    US $.88

12in RP-SMA right angle to right angle plug both female pin Jumper RG316 cable    US $3.30

N Female To SMA Male Plug Straight RF Connector Adapter    US $3.35

Antenna SMA-Female for PX-328 KG-UVD1P Wouxun 5-206    US $7.99

1pcs Pigtail RP-SMA Female to U.FL PCI-E Jumper Cable RF w Ferrite Adapter,BNL    US $1.80

SMA Male to Female Connector Antenna Extension Cable    US $5.02

Threaded N Male to SMA Female Jack Adapter Connector    US $4.54

10pcs T Type Three Female SMA Connector for Coaxial Cable    US $5.47

SMA Jack female to SMA Jack female bulkhead o-ring straight    US $.99

6 Lot SMA Female Jack to Female Jack Coupler or Barrel Adapter for Ham Radio    US $10.95

RH771 Long Antenna SMA-Female for KENWOOD PUXING WOUXUN    US $14.99

1pcs RF Connector Adapter SMA female to SMA male T type right angle    US $.99

UHF Female S0239 to SMA-F Socket Adaptor for Ham Radio    US $.99

SMA-Female to SMA-Female SF to SF adaptor PX-888K TG-UV2 UV-5R TH-UVF1 FD-268    US $.99

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