Map vs Dictionary (Look Up)

The source code for all benchmarks are in Tools/Towel.Benchmarking.

BenchmarkDotNet=v0.13.0, OS=Windows 10.0.19042.1110 (20H2/October2020Update)
Intel Core i7-4790K CPU 4.00GHz (Haswell), 1 CPU, 8 logical and 4 physical cores
.NET SDK=6.0.100-preview.6.21355.2
  [Host]     : .NET 5.0.8 (5.0.821.31504), X64 RyuJIT
  Job-HBXSTX : .NET 5.0.8 (5.0.821.31504), X64 RyuJIT

InvocationCount=1  UnrollFactor=1  

Method	N	Mean	Error	StdDev	Median
MapDelegates	10	686.4 ns	15.58 ns	34.53 ns	700.0 ns
MapStructs	10	361.6 ns	18.03 ns	52.89 ns	400.0 ns
Dictionary	10	251.5 ns	17.81 ns	52.22 ns	300.0 ns
MapDelegates	100	2,592.3 ns	33.21 ns	27.74 ns	2,600.0 ns
MapStructs	100	1,500.0 ns	0.00 ns	0.00 ns	1,500.0 ns
Dictionary	100	985.7 ns	21.61 ns	35.50 ns	1,000.0 ns
MapDelegates	1000	21,391.7 ns	101.57 ns	79.30 ns	21,400.0 ns
MapStructs	1000	12,292.9 ns	168.28 ns	149.17 ns	12,300.0 ns
Dictionary	1000	8,480.0 ns	162.63 ns	152.13 ns	8,400.0 ns
MapDelegates	10000	211,330.8 ns	3,541.49 ns	2,957.30 ns	209,400.0 ns
MapStructs	10000	122,541.2 ns	2,435.10 ns	3,932.24 ns	125,300.0 ns
Dictionary	10000	81,600.0 ns	1,394.85 ns	1,164.76 ns	81,500.0 ns