No. This phone do not have wireless FM.
Yes, Metro XL supports T9 type.
Samsung Metro XL does have 128 MB internal memory.
Yes, Charger is included in the standard packing.
Samsung Metro is the better phone if we compare the specifications.
01) Metro XL does have 2MP front camera while Nokia 3310 does not have front camera.
02) Metro XL comes with 2.8 Inch display while Nokia 3310 has 2.4 Inch display.
Both phone comes with standard 1 Year brand warranty but Nokia 3310 comes with replacement warranty.