At2021 vs at2031

[Alif23]

I am going to buy cardioid condenser microphone,
before I was thinking to buy Behringer B5 or AKG P170
but finally I decided to buy AT2021 based on my budget.
and yesterday I found AT2031 it was surprised because the price not really big different, and here's the specification

AT2021

ELEMENT : Fixed-charge back plate, permanently polarized condenser
POLAR PATTERN : Cardioid
FREQUENCY RESPONSE : 30-20,000 Hz
OPEN CIRCUIT SENSITIVITY : –39 dB (11.2 mV) re 1V at 1 Pa
IMPEDANCE 250 ohms
MAXIMUM INPUT SOUND LEVEL : 145 dB SPL, 1 kHz at 1% T.H.D.
NOISE : 19 dB SPL
DYNAMIC RANGE (typical) : 126 dB, 1 kHz at Max SPL
SIGNAL-TO-NOISE RATIO : 75 dB, 1 kHz at 1 Pa
PHANTOM POWER REQUIREMENTS : 48V DC, 2 mA typical
WEIGHT : 83 g (2.9 oz)
DIMENSIONS : 101.5 mm (4.00") long,
21.0 mm (0.83") maximum body diameter
OUTPUT CONNECTOR : Integral 3-pin XLRM-type
ACCESSORIES FURNISHED : Stand clamp; soft protective pouch
AUDIO-TECHNICA CASE STYLE : S1

and here's the AT2031

ELEMENT : Fixed-charge back plate, permanently polarized condenser
POLAR PATTERN : Cardioid
FREQUENCY RESPONSE :20 - 20,000 Hz
LOW FREQUENCY ROLL-OFF : 150Hz, 6dB/octave
OPEN CIRCUIT SENSITIVITY : – 34 dB (19.9 mV) re 1V at 1 Pa
IMPEDANCE : 85Ω
MAXIMUM INPUT SOUND LEVEL : 141 dB SPL, 1 kHz at 1% T.H.D.
NOISE : 17 dB SPL
DYNAMIC RANGE (typical) : 124 dB, 1 kHz at max SPL
SIGNAL-TO-NOISE RATIO : 77 dB, 1 khz at 1 Pa
PHANTOM POWER REQUIREMENTS : 48V DC, 2mA typical
SWITCHES : Flat, roll-off
WEIGHT : 134 g
DIMENSIONS : 143.0 mm long, 21.0 mm maximum body Ø
OUTPUT CONNECTOR : Integral 3-pin XLRM-type
ACCESSORIES FURNISHED : AT8405a stand clamp; windscreen; soft protective pouch


the different price was
AT 2021 : 89 $ USD
AT2031 : 132 $ USD
this amount based on currency exchange today in my country.

Based on those Specification
which the good one for nylon guitar live performance application ... ?
also maybe someone here have an experience using those microphone, you can share here

Thank you so much

[pipedwho]

These are both great instrument mics. For live performance of acoustic guitar you won't notice the difference between the two mics. The improvements are swamped by the realities of a live venue (even if fairly quiet). Which are mainly background noise, room dynamics, PA system, and the desk you're going in to.

For recording in a quiet environment, the AT2031 might be slightly 'better', but not significantly, and nothing that would have you thinking that you made the wrong choice.

The AT2021 is smaller, comes with a clamp and nice little pouch, and costs less. Cheaper to replace if you break it or lose it. Pretty much my choice to have in a gig bag for live use.