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awk print line with highest value

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# 1  
Old 04-27-2018
awk print line with highest value
grepping on a value but then want to print only those lines that have the highest value in the 4th column

Code:
log text text R59FJ
log text text R63FT
log text text R60JX
log1 text text R63EA
log1 text text R60JX

desired output
Code:
log text text R63FT
log1 text text R63EA

tried this but not getting the right output. Any help would be appreciated.
Code:
awk '!a[$4]++ && l {print l} {l=$0}; END {print l}'

# 2  
Old 04-27-2018
Code:
awk '$4 > a[$1] {a[$1]=$4; b[$1]=$0}; END {for (i in b) print b[i]}' infile

This User Gave Thanks to rdrtx1 For This Post:
jimmyf
# 3  
Old 04-28-2018
Although not mentioning it, neither in the specification nor in the sample code, your desired output implies you want the "maximum" per $1 value.
Are you talking of $4's entire string value, or of the numerical part only? What if it starts with an "S" or an "s"?
If you go for the numerical part, try
Code:
awk '{T = $4; gsub (/[^0-9]/, "", T); if (T > a[$1]) {a[$1]=T; b[$1]=$0}}; END {for (i in b) print b[i]}' file

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