Wifi. Intel vs Broadcom vs Asus

pscat pscat # iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

wlan1     IEEE 802.11bg  ESSID:"TP-LINK_DAF912"  
          Mode:Managed  Frequency:2.472 GHz  Access Point: Not-Associated   
          Tx-Power=20 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          
pscat pscat # lspci | grep Wirel
01:0a.0 Network controller: Broadcom Corporation BCM4318 [AirForce One 54g] 802.11g Wireless LAN Controller (rev 02)
pscat pscat # iwlist wlan1 scan
wlan1     Scan completed :
          Cell 01 - Address: D8:5D:4C:DA:F9:12
                    Channel:13
                    Frequency:2.472 GHz (Channel 13)
                    Quality=50/70  Signal level=-60 dBm  
                    Encryption key:off
                    ESSID:"TP-LINK_DAF912"
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              12 Mb/s; 24 Mb/s; 36 Mb/s
                    Bit Rates:9 Mb/s; 18 Mb/s; 48 Mb/s; 54 Mb/s
                    Mode:Master
                    Extra:tsf=000000ce23c4f150
                    Extra: Last beacon: 189ms ago
                    IE: Unknown: 000E54502D4C494E4B5F444146393132
                    IE: Unknown: 010882848B960C183048
                    IE: Unknown: 03010D
                    IE: Unknown: 2A0100
                    IE: Unknown: 32041224606C

ps / # lspci | grep Wirel
02:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02)
ps / # iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

wlan0     IEEE 802.11abg  ESSID:"TP-LINK_DAF912"  
          Mode:Managed  Frequency:2.472 GHz  Access Point: D8:5D:4C:DA:F9:12   
          Bit Rate=12 Mb/s   Tx-Power=15 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality=34/70  Signal level=-76 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:19  Invalid misc:652   Missed beacon:0

ps / # iwlist wlan0 scan
wlan0     Scan completed :
          Cell 01 - Address: D8:5D:4C:DA:F9:12
                    Channel:13
                    Frequency:2.472 GHz (Channel 13)
                    Quality=34/70  Signal level=-76 dBm  
                    Encryption key:off
                    ESSID:"TP-LINK_DAF912"
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              12 Mb/s; 24 Mb/s; 36 Mb/s
                    Bit Rates:9 Mb/s; 18 Mb/s; 48 Mb/s; 54 Mb/s
                    Mode:Master
                    Extra:tsf=000000ce2b022a15
                    Extra: Last beacon: 42ms ago
                    IE: Unknown: 000E54502D4C494E4B5F444146393132
                    IE: Unknown: 010882848B960C183048
                    IE: Unknown: 03010D
                    IE: Unknown: 2A0100
                    IE: Unknown: 32041224606C