I don't have either a Goldie or Thunderbird (and in what range; soprano, alto, low?), but have seen dozens of YouTube and manufacturer videos of them being played and reviewed. They're both premium instruments so it boils down to what you need.
Goldie has long earned a premium professional reputation for playability, reliability, tone and availability. When I first started learning about whistles I naturally wanted to find the full range from worst to best (I'd already found the worst, and barely escaped whistle futility), and Goldie, Burke and a few other builders were at the top of the quality list.
Then I found the Chieftain Thunderbird and what for me might be one of the ideals. As a flute player and wind instrument player for decades, I wanted instruments that have a range of expression and that are responsive, controllable and have a solid tonal centre. No toys or "beginner" level impediments to progress, I'm just sick of that kind of thing. I can supply loads of air. The Thunderbird is a larger-bore, more full range, lively and expressive option. If it takes or accommodates more air, that tells me it isn't fragile and that it generates a range of output from what's given (air pressures, attacks, sustain, clarity, breathiness, response in the third octave, everything). The soprano/high D options in the Thunderbird style, now offered as the Busker, continue the larger bore full-range option that stays controllable and musical in a wide range of playing approaches.
What do you want for yourself? What tone options are important to you? Playability? Are you advancing in your ability and want an instrument that will be there to advance in and facilitate performance options with you, and that stays "better" than you, and inspires progress? Does one whistle cover many needs?
Myself I think for a high D and alto range, I want at least 6 whistles (evidence of Whoad, and definitely fewer options for low whistles), to cover the range of tones and playability > 1) A whistle like the Walton's, Feadog Pro, Oak, Chris Wall, Tony Dixon Trad Brass or Reyburn take care of the basic tin whistle design and tone. 2) High quality tone out of plastics; consider the Goldfinch, Tony Dixon DX001, etc. 3) great tone out of aluminum means (a favorite high D I've played) look at models like the Tony Dixon aluminum DX006, Tony Dixon aluminum alto A, and look for ALBA, Burke, Shearwater, Tilbury, as well as the Goldie and Kerry/Chieftain Optima and other product lines, 4) the high quality wood and thick wall brass models for richer, deeper tone, with probably higher prices but ultimate reliability, like with Milligan, McManus and quite a few other small-production size makers, and 5) the powerful full-throated and high range of expression in large bore designs like the Thunderbird/Busker, and other players can chime in on what whistles also fit this type. 6) Bamboo, fifes, flageolets, novelty materials and designs. Bamboo is an excellent material for whistles and flutes, but the marketplace has a deceptive range of quality of product for sale, from highly faulty to "so-so", to excellent material and skilled crafting. Explore carefully.
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